Answer:
Only characteristics that are coded for by genes can be inherited. The shape of a person's face is inherited because this characteristic is coded for by genes. Characteristics that are due to environmental factors cannot be inherited. A scar due to an injury cannot be inherited because this characteristic is a result of an environmental factor.
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Who proposed a model that successfully explained the photoelectric effect?
A) Plank
B) Einstein
C) Compton
D) Rydberg
E) Bohr.
The photoelectric effect refers to the phenomenon where electrons are emitted from a material when it is illuminated with light. Before Einstein's proposal, the prevailing understanding of light was based on the wave theory of light, which suggested that light energy is transmitted continuously in the form of waves. However, there were several experimental observations that could not be explained by the wave theory alone.
Albert Einstein's proposal revolutionized the understanding of light and provided an explanation for the photoelectric effect. In his paper, Einstein proposed that light is composed of discrete packets of energy called photons. Each photon carries a specific amount of energy, which is related to the frequency of the light wave. The energy of a photon is given by Planck's equation: E = hf, where E is the energy, h is Planck's constant, and f is the frequency of the light.
According to Einstein's model, when light interacts with a material, such as a metal surface, the photons transfer their energy to electrons in the material. If the energy of a photon is sufficient to overcome the binding energy of an electron to the material, the electron can be ejected from the surface. This process is known as photoemission.
Einstein's model successfully explained several key observations of the photoelectric effect:
1. Threshold frequency: There is a minimum frequency (or equivalently, a minimum energy) of light below which no photoemission occurs. This can be explained by the fact that electrons require a minimum amount of energy to be freed from the material. The threshold frequency is directly related to the binding energy of the electrons in the material.
2. Intensity independence: The number of emitted electrons depends on the intensity (brightness) of the light, but the kinetic energy of the emitted electrons is independent of the intensity. This can be explained by the fact that the energy of each photon is fixed and does not depend on the number of photons present.
3. Electron energy distribution: The maximum kinetic energy of the emitted electrons increases linearly with the frequency of the light. This observation is consistent with the energy transfer from photons to electrons, where higher-frequency photons have more energy to transfer.
Einstein's model of the photoelectric effect provided strong evidence for the particle-like nature of light and contributed to the development of quantum mechanics. It laid the foundation for the understanding of the dual nature of light as both particles (photons) and waves, and it has wide-ranging applications in various fields, including solar cells, photodetectors, and spectroscopy.
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The James Webb Space Telescope is positioned around 1.5 million kilometres from the Earth on the side facing away from the Sun. The telescope remains at this distance and orbits around the Sun with the Earth’s orbital velocity.
--Determine the angular velocity ω of the telescope as it orbits around the Sun.
--The centrifugal Fω and gravitational force FG are acting on objects orbiting the Sun: F =Fω−FG. Based on this, how much should the telescope accelerate towards or away from the Sun?
--Why is the orbit of the telescope stable nonetheless? What other forces need to be considered?
The angular velocity depends on the length of the orbit and the orbital
speed of the telescope.
Response:
First question:
The angular velocity of the telescope is approximately 0.199 rad/sSecond question:
The telescope should accelerates away by approximately F = 0.0005·mThird question:
The pulling force between the Earth and the satelliteWhat equations can be used to calculate the velocity and forces acting on the telescope?The distance of the James Webb telescope from the Sun = 1.5 million kilometers from Earth on the side facing away from the Sun
The orbital velocity of the telescope = The Earth's orbital velocity
First question:
\(Angular \ velocity = \mathbf{\dfrac{Angle \ turned}{Time \ taken}}\)
The orbital velocity of the Earth = 29.8 km/s
The distance between the Earth and the Sun = 148.27 million km
The radius of the orbit of the telescope = 148.27 + 1.5 = 149.77
Radius of the orbit, r = 149.77 million kilometer from the Sun
The length of the orbit of the James Webb telescope = 2 × π × r
Which gives;
r = 2 × π × 149.77 million kilometers ≈ 941.03 million kilometers
Therefore;
\(Angular \ velocity = \dfrac{29.8}{941.03}\times 2 \times \pi \approx 0.199\)
The angular velocity of the telescope, ω ≈ 0.199 rad/sSecond question:
Centrifugal force force, \(F_{\omega}\) = m·ω²·r
Which gives;
\(F_{\omega} = m \cdot \dfrac{28,500^2 \, m^2/s^2}{149.77 \times 10^9 \, m} \approx 0.0054233 \cdot m\)
\(Gravitational \ force, F_G = \mathbf{G \cdot \dfrac{m_{1} \cdot m_{2}}{r^{2}}}\)
Universal gravitational constant, G = 6.67408 × 10⁻¹¹ m³·kg⁻¹·s⁻²
Mass of the Sun = 1.989 × 10³⁰ kg
Which gives;
\(F_G = 6.67408 \times 10^{-11} \times \dfrac{1.989 \times 10^{30} \times m}{149.77 \times 10^9} \approx 0.00592 \cdot m\)
Which gives;
\(F_{\omega}\) < \(F_G\), therefore, the James Webb telescope has to accelerate away from the Sun
F = \(\mathbf{F_{\omega}}\) - \(\mathbf{F_G}\)
The amount by which the telescope accelerates away is approximately 0.00592·m - 0.0054233·m ≈ 0.0005·m (away from the Sun)
Third part:
Other forces include;
The force of attraction between the Earth and the telescope which can contribute to the the telescope having a stable orbit at the given speed.Learn more about orbital motion here:
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please answerrrr need this asapppp
Answer:
A
Explanation:
It depends on the scale of the volcanic eruption. A smaller eruption may only affect the nearby area, but a large one can affect the whole world. For example, the Krakatoa eruption of 1883 created an ash cloud which lowered global temperatures and affected the climate for a year afterwards.
An explosive eruption by a single volcano can affect only the lifeforms living on the volcano. The correct option is B.
What is a volcano?A volcano is an opening in the Earth's surface through which molten rock, ash, and gas can escape. Volcanoes are formed by the movement of tectonic plates, which create weak spots or vents in the Earth's crust where magma can rise to the surface.
Volcanoes can form in different ways, but most are formed at plate boundaries, where one tectonic plate is moving under another (subduction zone), or where two plates are moving away from each other (divergent boundary). When magma rises to the surface, it can form a volcanic cone or mountain over time.
There are three main types of volcanoes, based on their shape and the type of eruptions they produce:
(i)Shield volcanoes - broad, gentle slopes formed by lava flows that spread out over a wide area.
(ii)Stratovolcanoes (also called composite volcanoes) - tall, steep-sided cones formed by alternating layers of lava, ash, and other volcanic debris.
(iii)Calderas - large, basin-shaped depressions that form when a volcano collapses or erupts so forcefully that it empties its magma chamber.
Volcanoes can be active, dormant, or extinct. Active volcanoes are those that have erupted recently or are expected to erupt soon, while dormant volcanoes have not erupted in a long time but could still erupt in the future. Extinct volcanoes are those that have not erupted in thousands of years and are unlikely to erupt again.
Here in the question,
An explosive eruption by a single volcano can have a significant impact on the surrounding environment and local communities, but its effects are generally limited to the immediate vicinity of the volcano. The eruption may release ash, gases, and lava flows that can cause damage to nearby ecosystems and affect the health of humans and animals living in the area. However, the effects are unlikely to extend beyond the local region, let alone affect lifeforms throughout the world.
Therefore, B. only the lifeforms living on the volcano, is the correct option.
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at the instant a ball is thrown horizontally with 100m/s, an identical ball is dropped from the same height. which ball hits the ground first? (ignore air resistance) * 1 point a)the horizontally thrown ball b)the dropped ball c)neither - they both hit the ground at the same time d)the horizontally thrown ball never reaches the ground. it keeps circling earth.
option c When a ball is thrown horizontally at 100 m/s, a second ball is dropped from the same height at the exact same moment neither they both hit the ground at the same time .Here gravitational force plays role.
Gravitational force tells if Any two bodies' mutual attraction is directly proportional to the sum of their masses and inversely proportional to the square of their separation. As a "thought experiment," Newton proposed the Newton's cannonball, which supports the idea that gravity is a powerful force that affects planetary motion.
He assumed a cannon on top of a very tall mountain peak in this thinking experiment. If the cannon is loaded with gunpowder and fired, the following situations might occur.
If the cannon's speed is modest, it will fall to Earth in a projectile motion.
If the speed of the cannon is equal to the orbital speed at that altitude, the cannonballNo change in gravity affects the speed of light.
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juie ran eight laps around her school's quarter mile track in 18 minutes. her average velocity was _______m/s
Answer:
About 3m/s
Explanation:
If Julie ran eight quarter mile laps, then she ran a total of 1/4 * 8=2 miles. 2 miles is about 3220 meters, and 18 minutes is 1080 seconds, meaning that her average velocity was about 3m/s. Hope this helps!
What is its average velocity during this 9.0-s interval?
The average velocity of the freely falling object released from rest that has an instantaneous velocity of 80 m / s at 9 s is 40 m / s
V = ( u + v ) / 2
V = Average velocity
u = Initial velocity
v = Final velocity
u = 0
v = 80 m / s
V = ( 0 + 80 ) / 2
V = 40 m / s
Average velocity is the overall velocity during a given period. It is found using the average value of initial and final velocities is the acceleration is constant.
The given question is incomplete. The complete question is:
If the instantaneous velocity of a freely falling object 9.0 s after it is released from a position of rest is 80 m / s. What is its average velocity during this 9.0-s interval?
Therefore, the average velocity of the freely falling object released from rest is 40 m / s
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How does radiant energy transform into
chemical energy?
Answer:
The radiant energy, which can convert to heat and or living systems that also can convert it into what we call chemical energy. An example would be, a potato plant that we know can capture photons, which then can convert to what is called light energy, also this is through photosynthesis, this is storing the chemical energy underground as carbohydrates.
A blue segmented circle on a Sectional Chart depicts which class airspace? (A) Class B. (B) Class C. (C) Class D.
The boundary of Class C airspace is depicted on a Sectional Aeronautical Chart by a solid Magenta line.
Like nautical charts do for boats or a roadmap does for cars, an aeronautical chart is a map made specifically to aid in the navigation of aeroplanes.
Pilots may find their position, a safe altitude, the best path to their destination, navigational aids all along way, alternate landing zones in case of an emergency while in flight, and other helpful information like radio frequencies & airspace limits using these charts as well as other tools.
There are long-distance maps for transoceanic travel as well as charts for all land masses on Earth. Each phase of flight requires a specific chart, which can range from a map of a specific airport facility to a summary of the instrument routes spanning a whole continent (such as global navigation charts), & so many different sorts in between.
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Two sets of solid double yellow lines spaced two or more feet apart indicate:.
Two Sets of solid double yellow lines with spaced two or more feet apart indicates that Do not drive on or over the barrier.
What are the line colors in lane control?Solid yellow lines - it is marked at the center of a road and used for two-way traffic.
Broken yellow lines - It indicate that you may pass if the broken line is next to your driving lane.
Two solid yellow lines - It indicates no passing or Do not drive on or over the barrier.
Two sets of solid double yellow lines are considered a barrier , make a left turn, or a U-turn to cross it.
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2. A bowling ball gun is fired horizontally at 248 m/s off a 192 m high cliff.
a. Where does the bowling ball land?
b. Where would a golf ball land? Why? Explain.
C. What is the velocity at impact with the ground? Make sure to include the impact angle.
To solve this problem, we can use the kinematic equations of motion. Since the bowling ball is fired horizontally, we know that the initial vertical velocity is zero. We can use the equation:
h = vi*t + (1/2)at^2
where h is the initial height of the cliff, vi is the initial vertical velocity (which is zero), a is the acceleration due to gravity (-9.8 m/s^2), and t is the time it takes for the ball to hit the ground.
Solving for t, we get:
t = sqrt(2h / g) = sqrt(2192 / 9.8) = 8.88 s
Where does the bowling ball land?Now that we know the time it takes for the ball to hit the ground, we can use the horizontal velocity to find the distance it travels:
d = v*t = 248 * 8.88 = 2203.24 m
Therefore, the bowling ball lands approximately 2203.24 meters away from the base of the cliff.
A golf ball would land at the same distance as the bowling ball. This is because the distance traveled by a projectile only depends on its initial velocity and the time it spends in the air. Since the golf ball and the bowling ball are fired with the same horizontal velocity, they will travel the same distance before hitting the ground, assuming they are both fired from the same height.
However, the golf ball would take longer to hit the ground because it has a lower initial vertical velocity than the bowling ball, so it would have a longer time of flight.
To find the velocity at impact, we can use the kinematic equation:
v^2 = vi^2 + 2ad
where v is the final velocity (which we want to find), vi is the initial vertical velocity (which is zero), a is the acceleration due to gravity (-9.8 m/s^2), and d is the distance traveled by the ball.
Using the distance found in part a, we get:
v^2 = 2*(-9.8)*2203.24
v = sqrt(2*(-9.8)*2203.24) = 196.67 m/s
The impact angle can be found using trigonometry. The angle theta can be found using the equation:
tan(theta) = opposite / adjacent
where the opposite side is the vertical distance the ball has fallen (which is 192 m) and the adjacent side is the horizontal distance the ball has traveled (which is 2203.24 m).
tan(theta) = 192 / 2203.24
theta = tan^-1(192 / 2203.24) = 5.02 degrees
Therefore, the velocity at impact with the ground is 196.67 m/s at an angle of 5.02 degrees.
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How do we know what parts make up the atom?
Atoms are discovered through a series of experiments, through each experiment different discoveries were made about atom which lead to the conclusion that atom is made up of particles.
What is an atom?An atom is the smallest unit which makes up of a molecule. An atom is made up of many subatomic particles such as proton, neutron, and electrons. An element is made up of same type of atoms.
Through a very long series of experiments, the structure of the atom was devised. Each one of the experiment was designed to look at a specific aspect of the atom. At early times, the atom was thought to be a solid ball of positive charge (protons) with electrons (negative charge) embedded in it. Then in 1909, Rutherford did an experiment through which he demonstrated that that picture of the atom was wrong and the positive charge was centered at the center of the atom in the nucleus and occupied a very small volume compared to the whole atom.
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a 0.160-kg hockey puck is moving on an icy, frictionless, horizontal surface. the puck is initially moving to the right with a speed of 3.00 m/s. what is the speed of the puck after a force of 12.0 n directed to the left is applied for 0.050 s?
The speed of the puck after the force is applied for 0.050 s is approximately 0.75 m/s to the left. Note that the negative sign indicates the direction
To find the speed of the hockey puck after the applied force, we can use Newton's second law of motion, which states that the net force acting on an object is equal to the mass of the object multiplied by its acceleration:
F_net = m * a
In this case, the net force acting on the puck is the applied force of 12.0 N directed to the left. The mass of the puck is 0.160 kg. We need to calculate the acceleration of the puck.
The acceleration can be calculated using the equation:
a = F_net / m
a = 12.0 N / 0.160 kg
a = 75 m/s²
Since the initial speed of the puck is to the right, and the force applied is to the left, the net force acts to oppose the motion. Therefore, the acceleration is negative (-75 m/s²).
To find the final speed of the puck, we can use the equation:
v_final = v_initial + a * t
where:
v_final is the final speed,
v_initial is the initial speed,
a is the acceleration,
t is the time.
Plugging in the given values:
v_final = 3.00 m/s + (-75 m/s²) * 0.050 s
v_final = 3.00 m/s - 3.75 m/s
v_final ≈ -0.75 m/s
The speed of the puck after the force is applied for 0.050 s is approximately 0.75 m/s to the left. Note that the negative sign indicates the direction, which in this case is opposite to the initial motion of the puck.
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How do data collected from tree rings provide evidence for climate
change?
Why isn’t this a answer when you search it
Answer:
Climate scientists compare the tree growth records to local weather records. For locations where a good statistical match exists between tree growth and temperature or precipitation during the period of overlap, the ring widths can be used to estimate past temperature or precipitation over the lifetime of the tree.
predicting how molecular speed distribution changes with temperature and molar mass
Molecular speed distribution is a measurement of the speed of molecules in a gas. The Maxwell-Boltzmann distribution is a model that explains the molecular speed distribution. The speed distribution of molecules varies based on temperature and molar mass.
The distribution is shifted towards higher speeds at higher temperatures, and lighter molecules have higher speeds at a given temperature. The molecular speed distribution depends on temperature and molar mass. Temperature and molar mass affect the average speed, most probable speed, and root-mean-square speed of molecules in a gas. The effect of temperature on the molecular speed distribution is expressed by the equation:v1/v2 = square root(T1/T2)Where v is the molecular speed, T is the temperature, and subscripts 1 and 2 represent different temperatures. According to this equation, as temperature increases, molecular speed also increases. The effect of molar mass on the molecular speed distribution is expressed by the equation:v1/v2 = square root(M2/M1)Where v is the molecular speed, M is the molar mass, and subscripts 1 and 2 represent different molecules. According to this equation, as the molar mass of a molecule increases, the molecular speed decreases.
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water enters the ground floor of a residential apartment building, flowing slowly into a wide pipe at high pressure. the water then rises and exits at high speed through a narrow pipe in a bathroom 3 stories above the ground floor. explain the factors that account for the lower pressure in the bathroom pipe.
The lower pressure in the bathroom pipe can be attributed to several factors.
First, as the water flows through the wide pipe on the ground floor, it loses some of its pressure due to friction and resistance from the pipe walls. Second, as the water travels up the narrow pipe to the bathroom, it encounters increased resistance due to the smaller diameter of the pipe. This increased resistance causes a drop in pressure as the water moves further away from the source. Additionally, any bends or turns in the pipe can also cause pressure drops. Therefore, the combination of friction, resistance, and pipe diameter all contribute to the lower pressure in the bathroom pipe despite the high pressure at the ground floor.
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Define colinear forces
Answer: Collinear forces are forces that have a common line of action, i.e. the line of action of the forces lies along a single straight line.
Explanation:
16. Determine the gravitational force of attraction between the Earth and Jupiter given the mass of the earth is 6 x 10^24 kg, the mass of Jupiter is 1898.6 x 10^24 kg and the closest distance is abou
The gravitational force of attraction between the Earth and Jupiter is approximately 1.32 x 10²⁸ N.
The gravitational force of attraction between two objects can be calculated using Newton's law of universal gravitation, which states that the force (F) is proportional to the product of their masses (m₁ and m₂) and inversely proportional to the square of the distance (r) between their centers. Mathematically, the formula is expressed as:
F = (G * m₁ * m₂) / r²
where G is the gravitational constant.
m₁ = 6 x 10²⁴ kg (mass of Earth)
m₂ = 1898.6 x 10²⁴ kg (mass of Jupiter)
r = 5.88 x 10¹¹ m (distance between Earth and Jupiter)
Plugging in the values into the formula, we have:
F = (6.67 x 10⁻¹¹ N m²/kg²) * (6 x 10²⁴ kg) * (1898.6 x 10²⁴ kg) / (5.88 x 10¹¹ m)²
Calculating the expression, we find:
F ≈ 1.32 x 10²⁸ N
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THE COMPLETE QUESTION IS:
Determine the gravitational force of attraction between the Earth and Jupiter given the mass of the earth is 6 x 10²⁴ kg the mass of Jupiter is 1898.6 x 10²⁴ kg and the closest distance is about 5.88 x 10¹¹
Identify the following physical quantities as scalars or vectors.speeddistancevelocitypositiondisplacementaverage velocityacceleration
Speed, distance, and position are scalar quantities, while velocity, displacement, average velocity, and acceleration are vector quantities.
Speed refers to how fast an object is moving and is a scalar quantity, with only magnitude, without direction. Distance is a scalar quantity that refers to the amount of space between two points, also having only magnitude.
Position is a scalar quantity that refers to the location of an object in space and also has only magnitude.
Velocity, on the other hand, is a vector quantity, as it has both magnitude and direction. It is the rate of change of an object's position over time.
Displacement is another vector quantity, and it refers to the change in position of an object from its starting point.
Average velocity is a vector quantity that is the average of all velocity changes during a certain time interval.
Acceleration is also a vector quantity and refers to the rate of change of velocity. It measures how quickly the velocity of an object changes, and like velocity, it has both magnitude and direction.
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Biological fluid mechanics, please answer all questions or at
least as much as possible
(a) The governing principles in fluid mechanics are described analyticaly by the conservation laws for mass, momentum, and energy. These can be stated either in integral form when applied to an extend
Biological fluid mechanics is a rapidly growing field of study that uses the principles of fluid mechanics to understand the behavior of fluids in biological systems. This includes the study of blood flow, mucus transport, and the swimming of microorganisms.
The field is essential for understanding the functioning of many biological systems and has led to new insights into the behavior of living organisms.
Biological fluid mechanics is a multidisciplinary field that draws on the expertise of engineers, physicists, biologists, and mathematicians.
As the field continues to develop, we can expect to see new applications in fields such as medicine, environmental science, and robotics.
Here are some of the specific applications of biological fluid mechanics:
Medicine: Biofluid mechanics can be used to design new medical devices, such as artificial heart valves and catheters.
Environmental science: Biofluid mechanics can be used to understand the transport of pollutants in water and air.
Robotics: Biofluid mechanics can be used to design robots that can swim or fly like animals.
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A piece of metal of density 7. 8x10³ kg/m³ weigh 20N in air. Calculate the apparent weight of the metal when completely immersed in a liquid of density 8. 3x10² kg/m³
The apparent weight of the metal when completely immersed in the liquid is 16.6 N. This can be calculated using the principle of buoyancy, where the buoyant force acting on the metal is equal to the weight of the liquid displaced by the metal.
Explanation:
The weight of the metal in air is given as 20 N. In the liquid, the buoyant force acting on the metal will partially offset its weight. The buoyant force is equal to the weight of the liquid displaced by the metal.
To calculate the weight of the liquid displaced, we need to find the volume of the metal. The volume can be determined using the density of the metal:
density = mass/volume
Rearranging the formula, we have:
volume = mass/density
Let's assume the mass of the metal is 'm' kg. The volume of the metal can be calculated as:
volume = m / (density of metal)
The weight of the liquid displaced is equal to the weight of this volume of liquid, which can be calculated as:
weight of liquid displaced = volume of metal × density of liquid × g
where g is the acceleration due to gravity.
Since the weight of the liquid displaced is equal to the buoyant force acting on the metal, we can equate the two:
weight of liquid displaced = buoyant force = apparent weight of metal in liquid
Therefore, we have:
volume of metal × density of liquid × g = apparent weight of metal in liquid
Rearranging the equation to find the apparent weight:
apparent weight of metal in liquid = volume of metal × density of liquid × g
Substituting the values, we get:
apparent weight of metal in liquid = (m / (density of metal)) × density of liquid × g
Plugging in the given values for the densities and acceleration due to gravity, we can calculate the apparent weight:
apparent weight of metal in liquid = (m / (7.8 × 10³ kg/m³)) × (8.3 × 10² kg/m³) × (9.8 m/s²)
Simplifying this equation will give us the apparent weight of the metal in the liquid, which is approximately 16.6 N.The apparent weight of the metal when completely immersed in the liquid is 16.6 N. This can be calculated using the principle of buoyancy, where the buoyant force acting on the metal is equal to the weight of the liquid displaced by the metal.
The weight of the metal in air is given as 20 N. In the liquid, the buoyant force acting on the metal will partially offset its weight. The buoyant force is equal to the weight of the liquid displaced by the metal.
To calculate the weight of the liquid displaced, we need to find the volume of the metal. The volume can be determined using the density of the metal:
density = mass/volume
Rearranging the formula, we have:
volume = mass/density
Let's assume the mass of the metal is 'm' kg. The volume of the metal can be calculated as:
volume = m / (density of metal)
The weight of the liquid displaced is equal to the weight of this volume of liquid, which can be calculated as:
weight of liquid displaced = volume of metal × density of liquid × g
where g is the acceleration due to gravity.
Since the weight of the liquid displaced is equal to the buoyant force acting on the metal, we can equate the two:
weight of liquid displaced = buoyant force = apparent weight of metal in liquid
Therefore, we have:
volume of metal × density of liquid × g = apparent weight of metal in liquid
Rearranging the equation to find the apparent weight:
apparent weight of metal in liquid = volume of metal × density of liquid × g
Substituting the values, we get:
apparent weight of metal in liquid = (m / (density of metal)) × density of liquid × g
Plugging in the given values for the densities and acceleration due to gravity, we can calculate the apparent weight:
apparent weight of metal in liquid = (m / (7.8 × 10³ kg/m³)) × (8.3 × 10² kg/m³) × (9.8 m/s²)
Simplifying this equation will give us the apparent weight of the metal in the liquid, which is approximately 16.6 N.
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What is the definition of period?
Answer:
A form of punctuation that marks the end of a sentence, statement, etc.
Explanation:
. is a period.
It can be used in a sentence, such as this one.
not sure what period you mean, but if you mean in history n stuff: it means a certain era/time something happened. like the "golden age" it's called that because it didn't last forever/ it was just a phase yknow?
you push on a 2-kg block initially at rest on a frictionless surface with 10n of force horizontal for 5m on level ground before letting go. the block slides into a loop with a radius of 0.5 m. what velocity will the block have at the top of the loop?
You push on a 2-kg block initially at rest on a frictionless surface with 10n of force horizontal for 5m on level ground before letting go. the block slides into a loop with a radius of 0.5 m. The velocity will the block have at the top of the loop is determined as 7.071 m/s.
To find the velocity, the given values are,
Mass m = 2 Kg
Force F = 10 N
Displacement = 5m
Radius = 0.5 m
What is Work energy theorem?The work-energy theorem states that the change in the kinetic energy is equal to the amount of work done.
Energy is ability to do work. To perform work, energy has to be spent. Work is said to be done whenever the force is applied to an object then the object is moved to a certain distance.
According to work energy theorem, the work done on an object is equal to the change in kinetic energy of the object.
So, work done = Kinetic energy
Force × Displacement = 1/2 mv²
Thus, the velocity can be determined as
velocity v = √(2×Force×Displacement/m)
Substituting all the given values,
Velocity, v = \(\sqrt{\frac{2*10*5}{2} }\)
v = √50
v = 7.071 m/s.
So, the block's velocity is determined as 7.071 m/s.
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What will happen to the force of friction when you increase the weight on the cart
A 65 kg man stands on a surfboard holding a 3 kg ball at rest. If the man throws the ballforward to his friend at 9 m/s, how fast will the man move and in what direction?
Given data:
* The initial velocity of the man is u_1 = 0 m/s.
* The initial velocity of the ball is u_2 = 0 m/s.
* The final velocity of the ball is v_2 = 9 m/s.
* The mass of the man is m_1 = 65 kg.
* The mass of the ball is m_2 = 3 kg.
Solution:
The initial momentum of the system is,
\(p_1=m_1u_1+m_2u_2\)Substituting the known values,
\(\begin{gathered} p_1=0+0 \\ p_1=0\text{ kgm/s} \end{gathered}\)The final momentum of the system is,
\(p_2=m_1v_1+m_2v_2\)where v_1 is the final velocity of the man,
Substituting the known values,
\(\begin{gathered} p_2=65v_1+3\times9 \\ p_2=65v_1+27 \end{gathered}\)According to the law of conservation of momentum,
\(\begin{gathered} p_1=p_2 \\ 0=65v_1+27 \\ 65v_1=-27 \\ v_1=\frac{-27}{65} \end{gathered}\)By simplifying,
\(v_1=-0.42\text{ m/s}\)Here, the negative sign indicates the direction of motion of man is opposite to the direction of motion of ball.
Thus, the speed of the man is 0.42 meter
describe a cars velocity when it goes around a track at a constant speed
Answer:
A race car on an oval track has a constant speed. But, as the race car goes around the track, the direction in which the car is moving changes. This means that the velocity of the car is changing. An object has constant velocity if neither the speed nor direction it is moving changes.When molecules collide, _________ energy is transferred from one molecule to the next.
a) A cell of dry air is moved vertically from its original position under adiabatic conditions. Depending on the temperature profile of the surrounding atmosphere, this gas cell can keep on moving in the same direction, or it may come back to its original position. Considering the temperature profile of the atmosphere, change of the air cell temperature as it moves up and down in the surrounding atmosphere, as well as relative densities of the air cell and atmosphere, explain why and when the atmosphere is considered to be convectively stable and convectively unstable. In answering this question, use diagrams of temperature change with altitude. (13 marks) b) Explain why the adiabatic lapse rate of dry air is different from the adiabatic lapse rate of wet saturated air. Show them both in a diagram. (5 marks) c) Wet unsaturated air rises from the ocean surface. The ambient lapse rate is higher than the adiabatic lapse rate for dry air. There is a temperature inversion layer at higher altitudes. Show in a schematic diagram how the temperature of the wet air changes with altitude, in comparison with the ambient temperature. Explain at what altitudes the cumulus clouds are formed and why. (7 marks)
The question addresses the stability of the atmosphere and the factors that determine convective stability or instability. It also explains the difference between the adiabatic lapse rate of dry air and wet saturated air.
a) The stability of the atmosphere is determined by the temperature profile and relative densities of the air cell and atmosphere. If the temperature of the surrounding atmosphere decreases with altitude at a rate greater than the adiabatic lapse rate of the air cell, the atmosphere is considered convectively stable.
In this case, the air cell will return to its original position. Conversely, if the temperature of the surrounding atmosphere decreases slower than the adiabatic lapse rate of the air cell, the atmosphere is convectively unstable. The air cell will continue moving in the same direction.
b) The adiabatic lapse rate refers to the rate at which temperature decreases with altitude for a parcel of air lifted or descending adiabatically (without exchanging heat with its surroundings). The adiabatic lapse rate of dry air is higher (around \(9.8^0C\) per kilometer) compared to the adiabatic lapse rate of wet saturated air (around 5°C per kilometer).
This difference arises because when water vapor condenses during the ascent of saturated air, latent heat is released, reducing the rate of temperature decrease. A diagram can illustrate the difference between the two lapse rates, showcasing their respective slopes.
c) When wet unsaturated air rises from the ocean surface, its temperature decreases at a rate equal to the dry adiabatic lapse rate. However, if the ambient lapse rate (temperature decrease with altitude) is higher than the adiabatic lapse rate for dry air, a temperature inversion layer forms at higher altitudes.
In this inversion layer, the temperature increases with altitude instead of decreasing. A schematic diagram can depict the temperature changes of the wet air in comparison to the ambient temperature, showing the inversion layer.
Cumulus clouds form at the altitude where the rising moist air reaches the level of the temperature inversion layer. These clouds are formed due to the condensation of water vapor as the air parcel cools to its dew point temperature.
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Which of the following planets or moons has an atmosphere consisting mainly of Hydrogen and Helium with some methane?
A) Venus
B) Saturn
C) Titan
D) Uranus
Saturn is the following planet or moon, and its atmosphere is primarily made of hydrogen with a small amount of methane.
The correct answer is B
What makes Saturn the best planet?The planet Saturn is incredibly large and its rings make it incredibly gorgeous. Amazing moons as Titan reside there as well. The Solar System's Saturn is arguably the most popular and stunning planet. Compared to the rings of other planets, Saturn's are much larger and easier to see.
Where could we possibly live?Then, only a year ago, researchers found a second Earth-like planet around Proxima Centauri, one of our nearest nearby stars. The best option we now have for maintaining human life is this planet.
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Can someone help me with this please
what is most likey the effect of the forces being applied to the rope
a. the rope will not move
b.the rope will move to the right
c.the rope will move to the left
d.the rope will move up
Answer:
Your answer would be A.
Explanation:
A. the rope will not move
can someone please help
Answer:
could you probably expand on the question?
Explanation: