Which of the following is an example of an unbalanced force?
1.A stroller being pushed
2.A chair leaning on the wall
3.A ball on the grass
4.A book sitting on a table
Answers
Answer:
4.A book sitting on a table
Explanation:
I think it D I took the test last year
Related Questions
Usually, large amount of curent flows in a
Circuit due to two reasons ———— and ————.
Answers
Answer:
Explanation:
Possible causes for overcurrent include short circuits, excessive load, incorrect design, an arc fault, or a ground fault. Fuses, circuit breakers, and current limiters are commonly used overcurrent protection (OCP) mechanisms to control the risks
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1 800 cm³ of fresh water of density 1000 kgm is mixed with 2 200 cm³ of sea water of
density 1 030 kgm³. Calculate the density of the mixture.
Answers
1,013.75 kg/m3 is what's found to be the mixture's density.
Describe density in plain terms.Per unit of length, area, or volume, there is a certain amount of something: as. : celebration of an object per unit volume.
Describe a density example.A polystyrene cup can float in water whereas a ceramic cup will fall due to the difference in density between the two materials. Due to its lower density than water, wood typically floats on the surface of liquids. Generally speaking, rocks sink because they are denser than water.
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fill in the blanks
11) Stored energy is called ________ energy.
12) When you move your hand or foot, your body has converted potential energy into ________ energy.
13) When coasting while roller skating, you eventually stop due to ________.
14) A ball has 100 J of potential energy when it is on a shelf. The kinetic energy of the ball the instant it hits the floor is ________J.
Answers
PLS HELP!!! Response: Develop a unique example (not posted on the discussion board by anyone else) and calculate the resultant displacement between two points when there are two legs or distinct parts to the trip. Include the displacement of each leg of the trip as well as the resultant displacement of the entire trip. Don't forget: include both the direction and the magnitude as part of the displacement. Research the actual distance between these two points on the globe. Compare the resultant displacements and account for the error. Don't forget: include both the direction and the magnitude as part of the displacement.
Answers
Answer:
he is the first person can be 3in and a 6man is the best not a man of the hartford
if the change in thermal energy is 140j mass is 27kg and temperature change is 11ﾟC what is the specific heat capacity
Answers
The specific heat capacity formula is used to determine the quantity of heat required to alter the temperature of a unit mass of a substance by one degree Celsius.
The symbol c represents specific heat, and its SI unit is J/kg °C. The formula is:Q = mc∆THere, Q represents the change in thermal energy, m represents the mass of the object, c represents the specific heat, and ∆T represents the change in temperature.In order to determine the specific heat of a substance, we can substitute the given values into the above formula.Q = mc∆T140 J = (27 kg) c (11°C)c = 140 J / (27 kg × 11°C)Therefore, the specific heat capacity of the substance is approximately 0.479 J/kg °C.For such more question on Celsius
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which type of galaxy is very difficult to see, but (astronomers recently realized) may be very common?
Answers
Although incredibly difficult to view, dwarf elliptical galaxies may be very widespread.
Do you know the truth about dwarf galaxy clusters?Dwarf On a smaller scale than conventional elliptical galaxies, elliptical galaxies seem to share much of the same global characteristics. They have an elliptical shape, little to no gas, and no signs of recent star formation.
what is The Milky Way is elliptical, ?The Night Sky is a massive cluster of stars, gas, and dust. Because it would appear to be a whirling pinwheel from top or bottom, this galaxy is known as a spiral galaxy. About 25,000 light-years from the galactic center, in one of the spiral arms, is where the Sun can be found.
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An object of uniform density applies its gravitaitonal force at __
Answers
An object of uniform density applies its gravitational force at its center of mass.
An object of uniform density applies its gravitational force at its center of mass. This is because the force of gravity is a result of the object's mass being concentrated at a single point, and the center of mass is the point where the object's mass is evenly distributed in all directions. Therefore, any object with uniform density will apply its gravitational force at its center of mass.
The centre of mass of an object with homogeneous density is where gravitational force acts. This is so because the centre of mass is where the object's mass is evenly distributed in all directions and the force of gravity results from the object's mass being concentrated at a single location. As a result, the centre of mass of any object with uniform density will experience gravitational pull.
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When a 5 kg rock is dropped from a height of 6 m on Planet X, it loses 24 J of GPE. What is the acceleration due to gravity on Planet X?
Answers
Answer:
g = 1.25m/s²
Explanation:
Given the following data;
Mass = 5kg
Height = 6m
Gravitational potential energy = 24J
To find the acceleration due to gravity;
Potential energy can be defined as an energy possessed by an object or body due to its position.
Mathematically, potential energy is given by the formula;
\( P.E = mgh\)
Where,
P.E represents potential energy measured in Joules.
m represents the mass of an object.
g represents acceleration due to gravity measured in meters per seconds square.
h represents the height measured in meters.
GPE = mgh
Substituting into the equation, we have;
24 = 5*6*g
24 = 30g
g = 30/24
g = 1.25m/s²
Therefore, the acceleration due to gravity on Planet X is 1.25m/s².
Answer:
g=0.8m/s^2
Explanation:
M=5kg
h=6m
GPE=24J
GPE=Mgh
g=GPE/Mh
g=24J/(5kg)(6m)=0.8
g=0.8m/s^2
what determines G the acceleration of gravity on the surface of a planet or Moon
Answers
Answer:
distance from the center of the planet
Explanation:
Describe how and where distribution changes
Answers
Distribution changes can occur through processes like diffusion, mixing, phase changes, chemical reactions, and external factors, leading to alterations in the spatial arrangement or dispersion of a substance.
The distribution of a substance can change in various ways depending on the specific scenario and factors involved. Here are a few examples of how and where distribution changes can occur:
Diffusion: Distribution can change through the process of diffusion, where molecules or particles move from an area of higher concentration to an area of lower concentration. This can result in a more even distribution of the substance throughout a given space.
Mixing: Distribution changes can occur when substances are mixed together. For example, if two liquids or gases with different compositions are combined, they can mix to form a uniform distribution.
Phase changes: When a substance undergoes a phase change, such as melting, evaporation, condensation, or solidification, the distribution can change. For instance, as a liquid evaporates, the molecules transition from a condensed phase to a dispersed phase, leading to changes in the distribution.
Chemical reactions: Distribution changes can also occur during chemical reactions. Reactants may combine to form new products, leading to a redistribution of the elements or compounds involved.
External factors: External factors such as temperature, pressure, and external forces can influence the distribution of substances. For example, changes in temperature or pressure can affect the solubility of a substance, leading to changes in its distribution between different phases (e.g., solid, liquid, gas).
Therefore, The specific location or area where the distribution changes depend on the nature of the system and the factors driving the change. It could occur throughout a container, in a specific region within a solution, or within a confined space where diffusion or mixing is taking place. The extent and pattern of the distribution change will depend on the conditions and mechanisms involved in the process.
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HELP all electromagnetic waves travel through
1-air
2-tissue
3-space
4-molecules
Answers
Answer:
space is the answerrrerreer
Where on a roller coaster are there equal amounts of potential energy and kinetic energy?
Answers
Answer:
Picture?
Explanation:
The roller coaster will have equal kinetic and potential energy at any point starting from rest and reaching the minimum height.
The given problem is based on the concepts and fundamentals of kinetic energy and potential energy. The energy of an object by virtue of its position is known as kinetic energy. And the energy of object by virtue of its position is called potential energy.
In the given problem, the roller coaster will have highest potential energy at maximum height, but will have least kinetic energy there.Similarly, it will have maximum kinetic energy at the bottom of slide, but will have least potential energy there.So, at any point between starting from rest and reaching minimum height it will have both potential and kinetic energy in equal magnitude.Thus, we can conclude that the roller coaster will have equal kinetic and potential energy at any point starting from rest and reaching the minimum height.
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An atom of xenon has a mass number of 127 amu. How many neutrons
does it contain? *
Answers
Answer:
73 neutrons.
Explanation:
Data obtained from the question:
Mass number of Xenon = 127.
Neutron number =...?
We can obtain the number of neutron present as follow:
Atomic number of Xenon = 54
Recall:
Atomic number = proton number = 54
Mass number = proton + neutron
127 = 54 + Neutron
Neutron = 127 – 54
Neutron = 73.
Therefore, 73 neutrons are present in the Xenon atom.
Explain how speed, velocity, and acceleration relate to a roller skater skating around the rink
Answers
A roller skater skating around the rink provides a good example of how speed, velocity, and acceleration are related.
Speed is the magnitude of the roller skater's velocity, which is the rate at which the roller skater moves around the rink.
Velocity is a vector quantity that describes both the speed and direction of the roller skater's motion.
Acceleration is the rate at which the velocity of the roller skater changes.
Speed: If the roller skater moves one lap around the rink in 30 seconds, for example, then the speed is the distance traveled per unit time, which is one lap divided by 30 seconds.
Velocity: If the roller skater is moving around the rink in a counterclockwise direction, for example, then the velocity is counterclockwise and its magnitude is the speed of the roller skater.
Acceleration: Since velocity is a vector quantity, any change in velocity involves a change in speed, direction, or both. If the roller skater is speeding up while going around a turn, for example, then the acceleration is directed towards the center of the turn and is known as centripetal acceleration.
In summary, a roller skater skating around the rink illustrates how speed, velocity, and acceleration are related. The speed describes the magnitude of the roller skater's motion, the velocity describes both the speed and direction of the motion, and the acceleration describes the rate at which the velocity changes, including changes in speed, direction, or both.
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Activity: Is it the same?!
Reflection of light (and other forms of electromagnetic radiation) occurs when the waves encounter a surface or other boundary that does not absorb the energy of the radiation and bounces the waves away from the surface. The simplest example of visible light reflection is the surface of a smooth pool of water, where incident light is reflected in an orderly manner to produce a clear image of the scenery surrounding the pool. Throw a rock into the pool (see Figure 1), and the water is perturbed to form waves, which disrupt the reflection by scattering the reflected light rays in all directions.
Some of the earliest accounts of light reflection originate from the ancient Greek mathematician Euclid, who conducted a series of experiments around 300 BC, and appears to have had a good understanding of how light is reflected. However, it wasn't until a millennium and a half later that the Arab scientist Alhazen proposed a law describing exactly what happens to a light ray when it strikes a smooth surface and then bounces off into space.
In this activity you will be working as an engineer that is working to modify different kinds of digital cameras and to study the effect of changing incident angle on the reflected angle.
Method
Explain the steps of your experiment and identify the scientific variables:
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
• Independent Variable
----------------------------------------------------------------------------------------------------------------
• Dependent Variable
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
if anyone does ib myp 3. pleaseeee helppp im gonnnnaaa fail.
sciences by concept myp 3 formative assesment.
im giving 50 points please just help meeeeeeeeeeee
Answers
Answer:r other boundary that does not absorb the energy of the radiation and bounces the waves away from the surface. The simplest example of visible light reflection is the surface of a smooth pool of water, where incident light is reflected in an orderly manner to produce a clear image of the scenery surrounding the pool. Throw a rock into the pool (see Figure 1), and the water is perturbed to form waves, which disrupt the reflection by
Explanation:
Activity: Is it the same?!
Reflection of light (and other forms of electromagnetic radiation) occurs when the waves encounter a surface or other boundary that does not absorb the energy of the radiation and bounces the waves away from the surface. The simplest example of visible light reflection is the surface of a smooth pool of water, where incident light is reflected in an orderly manner to produce a clear image of the scenery surrounding the pool. Throw a rock into the pool (see Figure 1), and the water is perturbed to form waves, which disrupt the reflection by scattering the reflected light rays in all directions.
Some of the earliest accounts of light reflection originate from the ancient Greek mathematician Euclid, who conducted a series of experiments around 300 BC, and appears to have had a good understanding of how light is reflected. However, it wasn't until a millennium and a half later that the Arab scientist Alhazen proposed a law describing exactly what happens to a light ray when it strikes a smooth surface and then bounces off into space.
In this activity you will be working as an engineer that is working to modify different kinds of digital cameras and to study the effect of changing incident angle on the reflected angle.
Method
Explain the steps of your experiment and identify the scientific variables:
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
• Independent Variable
----------------------------------------------------------------------------------------------------------------
• Dependent Variable
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
if anyone does ib myp 3. pleaseeee helppp im gonnnnaaa fail.
sciences by concept myp 3 formative assesment.
im giving 50 points please just help meeeeeeeeeeee
Question 2 (1 point) ✓ Saved
(3.03.b_Q2) NOTE: The same story problem is used for questions 1 - 5: In a
piston/cyclinder gas container, the piston starts with a inside gas volume of 3.0 cc
and a pressure of 0.8 atmosphere at room temp. The piston is pushed into the
cylinder, reducing the volume to 1.0 cc. The piston/cylinder is left to equilibrate
back to room temp before measuring the final pressure.
Which gas law formula should be used to solve this opportunity?
constant volume, initial P/T = final P/T
constant temperature, initial PV = final PV
constant pressure, initial V/T = final V/T
density = mass/volume
Answers
Answer:
The gas law formula that should be used to solve the opportunity is;
Constant temperature, initial P·V = final P·V
Explanation:
From the question we have;
The initial volume of the cylinder, v₁ = 3.0 cc
The initial pressure of the gas in the cylinder, p₁ = 0.8 atm
The initial temperature of the gas in the cylinder, T₁ = Room temperature
The final volume of the cylinder, v₂ = 1.0 cc
The final pressure of the gas in the cylinder = p₂
The final temperature of the gas in the cylinder, T₂ = Room temperature
The gas law formula that should be used to solve the opportunity is Boyle's law which states that at constant pressure the pressure, of a given mass of gas is inversely proportional to the volume of the gas
Mathematically, Boyle's law can be expressed as follows;
P ∝ V
∴ P₁·V₁ = P₂·V₂
Which gives;
Constant temperature, initial P·V = final P·V
Three identical rocks are launched with identical speeds from the top of a platform of height 0 h . The rocks are launched in the directions indicated above. Rock 1, of mass m, reaches a maximum height hmax after being launched. During the time between the instant rock 1 is launched from height h0 and the instant it returns to height h0, the work done on the rock by the gravitational force is
Answers
The work done by the gravitational force on rock 1 can be calculated using the work-energy theorem. This theorem states that the net work done on an object is equal to the change in its kinetic energy.
What is gravitational force?Gravitational force is the attractive force between two objects that is proportional to their masses and inversely proportional to the square of the distance between them. It is the weakest force in nature and is the reason why objects with mass are attracted to each other. This force was first described by Isaac Newton in his law of universal gravitation, which states that the force between two objects is proportional to the product of their masses and inversely proportional to the square of the distance between them.
Since the rock is launched from rest at a height of h0 and then returns to the same height, its kinetic energy does not change and therefore the net work done on the rock is zero. This means that the work done by the gravitational force on the rock is also zero, since the only force acting on the rock is the gravitational force.
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intravenous infusions are usually made with the help of the gravitational force. assuming that the density of the fluid being administered is 1,020 kg/m3, at what height should the iv bag be placed above the entry point so that the fluid just enters the vein if the blood pressure in the vein is 2.7 x 103 pa above atmospheric pressure? assume that the iv bag is collapsible. (hint: atmospheric pressure is applicable in the entire situation)
Answers
The IV bag should be placed approximately 10.19 meters above the entry point to ensure that the fluid just enters the vein, considering the blood pressure in the vein and assuming atmospheric pressure is applied.
Given:
Density of the fluid being administered = 1,020 kg/m³
Blood pressure in the vein = 2.7 × 10³ Pa above atmospheric pressure
Since the fluid is administered using gravitational force, the pressure at the entry point of the vein should be higher than the pressure at the IV bag.
The pressure difference can be calculated using the formula:
Pressure difference = density × gravitational acceleration × h
The pressure difference should be equal to the sum of the blood pressure in the vein and the atmospheric pressure:
Pressure difference = (blood pressure in the vein) + (atmospheric pressure)
h = (pressure difference) / (density × gravitational acceleration)
h = [(2.7 × 10³) + (101,325)] / (1,020 × 9.8)
h ≈ 10.19 meters
Therefore, the IV bag should be placed approximately 10.19 meters above the entry point to ensure that the fluid just enters the vein, considering the blood pressure in the vein and assuming atmospheric pressure is applicable throughout the situation.
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who has a iphone (age range 15-19 )
Answers
Hi friend! I have an iPhone. why do you ask????
A wooden block with mass 1.15 kg is placed against a compressed spring at the bottom of a slope inclined at an angle of 29.0° (point A). When the spring is released, it projects the block up the incline. At point B, a distance of 7.55 m up the incline from A, the block is moving up the incline at a speed of 6.25 Im/s and is no longer in contact with the spring. The coefficient of kinetic friction between the block and incline is 0.45. The mass of the spring is negligible.
Constants Part A Calculate the amount of potential energy that was initially stored in the spring. Take free fall acceleration to be 9.80 m/s^2.
Answers
To calculate the amount of potential energy initially stored in the spring, we need to consider the conservation of mechanical energy.
The mechanical energy of the block-spring system is conserved when no external forces other than gravity and friction are acting on it. At point A, the mechanical energy is stored entirely as potential energy in the compressed spring. The potential energy stored in the spring can be calculated using the formula: Potential Energy (PE) = (1/2)kx^2
where k is the spring constant and x is the displacement of the spring from its equilibrium position.
To find the spring constant, we need to know the force constant of the spring (k) or the spring's compression distance (x). Unfortunately, this information is not provided in the given question. If you have any additional information about the spring constant or the compression distance, please provide it so that I can assist you further.
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The atmospheric pressure above a swimming pool changes from 837 to 842 mm of mercury. The bottom of the pool is a rectangle (10 m ⨯ 25 m). By how much does the force on the bottom of the pool increase?
Answers
Answer:
Change in force = 1.66 × 10⁵ N
Explanation:
Given:
Initial pressure = 837 mmHg
Final pressure = 842 mmHg
Rectangle (10 m ⨯ 25 m)
Find:
Change in force
Computation:
Change in force = (Change in pressure)(Area)(133 pa / 1 mmHg)
Change in force = (842 - 837)(10 m ⨯ 25 m)(133 pa / 1 mmHg)
Change in force = (166,250)
Change in force = 1.66 × 10⁵ N
A 65-kg swimmer pushes on the pool wall and accelerates at 6 m/s^2. The friction experienced by the swimmer is 100 n. What is the magnitude of the force that the swimmer applies on the wall?.
Answers
For a 65-kg swimmer to push against the pool wall, there is a force of 490N applied, and the swimmer accelerates at a speed of 6 m/s2. The swimmer encounters 100 n of friction.
According to Newton's second law,
sum Force = mass × acceleration
Fm - Ff = ma
Fm is the moving force
If s the frictional force = 100N
mass = 65kg
acceleration = 6m/s²
Required
Moving force Fm
Substitute the given force into the expression and get Fm
Fm -100 = 65(6)
Fm -100 = 390
Fm = 390+100
Fm = 490N
Hence the force that will cause two carts to move is 490N.
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If the roller coaster car in the above problem were moving with twice the speed(20m/s), then what would be its new kinetic energy?
Answers
Answer:
KE = 1.05 x105 Joules
Explanation:
KE = 4 * (1.04653 x 105 J) = 4.19 x 105 Joules.
a certain radio wave has a frequency of 1.91 mhz. what is the wavelength in meters? use significant figures and the correct units.
Answers
The wavelength is 156 meters when a certain radio wave has a frequency of 1.91 mhz.
Since radio waves are electromagnetic energy and move at the speed of light,
2.998×10⁸ m/s to four significant figures.
The speed of light is equal to the wavelength times the frequency of electromagnetic energy.
The formula for the speed of light is c= λ⋅v, where λ is the wavelength and ν is the frequency in Hz.
Known/Given
c=2.998×10⁸ m/s
ν=1.91mHz×1000000Hz/1mHz =1910000 Hz
=1.91×10⁶ Hz
Unknown
λ
Equation
c=λ⋅ν
Solution
Solve the equation after rearranging it to isolate wavelength.
1 Hz = 1/s
λ=c/ν=2.998×10⁸ m/s / 1.91x10⁶ 1/s
= 156 m to three significant figures
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1.Galileo conducted experiments from the top of the Leaning Tower of Pisa. If he dropped a piece of burlap tied into a ball with twine and a 2-pound rock at the same time, what would he have seen and why? (5 points)
Answers
Answer:
The time for both of the balls to reach the ground would be the same.
Explanation:
If no air resistance is present, the rate of descent depends only on how far the object has fallen, no matter how heavy the object is. This means that two objects will reach the ground at the same time if they are dropped simultaneously from the same height. ... In air, a feather and a ball do not fall at the same rate.
jamarious wants to transfer energy by electrical current for a class project. he begins observing simple household examples of electrical currents moving energy. which answer choice is not an example of energy transferring through electricity?
Answers
Lighting a candle when the power goes out to provide light, is not an example of energy transferring through electrical current.
Every user of electricity, including lights, heaters, stoves, cell phones, computers, refrigerators, and on and on, will turn electricity into some sort of electromagnetic radiation. With the exception of one, all three examples show how electricity can transmit energy in a typical residential setting. Candles are the non-example since they don't need electricity or electricity to provide light when the power goes out. A candle does generate light and heat energy, but it does so chemically after the wick is lit by the match. The remaining instances all involve harnessing electricity to effect change.
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The above question was incomplete. Check below the full question:
Jamarious wants to transfer energy by electrical current for a class project. He begins observing simple household examples of electrical currents moving energy. Which answer choice is NOT an example of energy transferring through electricity?
A) Lighting a candle when the power goes out to provide light.
B) Using an air conditioner to cool the house down in the summer.
C) The doorbell ringing through the house from the front porch.
D) Pre-heating the oven to bake fresh cookies
the dependence of the rate constant on temperature is expressed by which equation?
a. The arrhenius equation
b. The de broglie equation
c. The vanât hoff equation
d. Temperature has no effect on the rate constant
Answers
a. The Arrhenius equation
What is Arrhenius equation?
The Arrhenius equation is a mathematical expression that describes the relationship between the rate constant of a chemical reaction and temperature. The equation states that the rate constant of a reaction is proportional to the frequency factor (A), which is related to the activation energy (Ea) and the absolute temperature (T) according to the following formula:
k = Ae^(-Ea/RT)
where:
k is the rate constant,
A is the frequency factor,
Ea is the activation energy,
R is the gas constant, and
T is the absolute temperature.
The Arrhenius equation is a useful tool for predicting the effect of temperature on the rate of a chemical reaction. By measuring the rate constant at different temperatures, it is possible to determine the activation energy of the reaction, which provides important information about the mechanism of the reaction. The Arrhenius equation is widely used in the fields of chemistry, biology, and material science to study the kinetics of reactions and to design and optimize processes that involve chemical reactions.
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The correct answer is a. The Arrhenius equation. The dependence of the rate constant on temperature is expressed by the arrhenius equation.
What is Arrhenius equation?The Arrhenius equation is a mathematical expression that describes the relationship between the rate constant of a chemical reaction and temperature. The equation states that the rate constant of a reaction is proportional to the frequency factor (A), which is related to the activation energy (Ea) and the absolute temperature (T) according to the following formula:
\(k = Ae^(-Ea/RT)\)
where:
k is the rate constant,
A is the frequency factor,
Ea is the activation energy,
R is the gas constant, and
T is the absolute temperature.
The Arrhenius equation is a useful tool for predicting the effect of temperature on the rate of a chemical reaction. By measuring the rate constant at different temperatures, it is possible to determine the activation energy of the reaction, which provides important information about the mechanism of the reaction. The Arrhenius equation is widely used in the fields of chemistry, biology, and material science to study the kinetics of reactions and to design and optimize processes that involve chemical reactions.
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A 0.155 kg arrow is shot upward
at 31.4 m/s. What is its kinetic
energy (KE) when it leaves the
bow?
Answers
Answer:
KE = ½mv² = ½(0.155)(31.4)² = 76.4 J
Explanation:
The kinetic energy (KE) of the 0.155 kg arrow when it leaves the bow is 76.4 joule.
What is kinetic energy?Kinetic energy is a type of power that a moving object or particle possesses. An item accumulates kinetic energy when work, which involves the transfer of energy, is done on it by exerting a net force.
A moving object or particle has kinetic energy, which depends on both its mass and its rate of motion.
Given parameters:
Mass of the arrow: m = 0.155 kg.
Upward velocity of the arrow: v = 31.4 m/s.
Hence, The kinetic energy (KE) of the arrow = 1/2 × mass × velocity²
= 1/2 × 0.155 × 31.4 joule
= 76.4 joule.
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two objects are sliding at the same speed across a wooden surface. the coefficient of kinetic friction between the first object and the surface is twice that between the second object and the surface. the distance traveled by the first object before it stops is s. the distance traveled by the second object is .
Answers
When it is given that the distance traveled by the first object before it stops is S, then the distance traveled by the second object is 2S.
What do you understand by coefficient of kinetic friction?The ratio of the friction force to the normal force experienced by a body moving on a dry and non-smooth surface is said as the kinetic friction coefficient, μk.
Under the high velocity conditions, kinetic friction coefficient increases with the velocity. And as velocity increases so the distance also increases.
The kinetic friction formula is given as normal × friction coefficient. So, if force is increased then the normal force is not changed, due to which the friction remains constant.
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How fast will a bug that is going 640cm in 320 seconds travel across the
floor? *
O 2 seconds
O 2.56 cm/s
O 40,000 seconds
O 2 cm/s
Answers
Answer:
2 cm/s
Explanation:
As, 640cm/320s = 2cm/1s
Therefore, 2cm/ s