A ladder is balanced against a wall without moving. What
must be true about this ladder?
Answers
Answer:a no net force
Explanation: google lol
Related Questions
How much work is required to move an electron
through a potential difference of 3.00 volts?
(1) 5.33 × 10^–20 J (3) 3.00 J
(2) 4.80 × 10^–19 J (4) 1.88 × 10^19 J
Answers
Answer:
(2) the work required to move the electron is 4.8 x 10⁻¹⁹ J.
Explanation:
Given;
potential difference, V = 3.00 volts
charge of electron, q = 1.6 x 10⁻¹⁹ C
The work required to move an electron is calculated as;
W = Vq
where;
W is the work done in Joules
Substitute the given values and solve for W;
W = (3.00)(1.6 x 10⁻¹⁹)
W = 4.8 x 10⁻¹⁹ J.
Therefore, the work required to move the electron is 4.8 x 10⁻¹⁹ J.
Consider the following true statement about potential energy: 'Changes in potential energy are associated with changes in shape of a system, or changes in relative positions of the objects that make up the system. A system consisting of a single object that undergoes no change in shape or other internal changes does not have a change in potential energy." Explain how your answer to the third bullet of part b.ii is consistent with this statement. If it is not consistent, how could you change it to make it consistent?
Answers
The statement about potential energy is generally true and describes the relationship between potential energy and changes in the shape or relative positions of objects within a system.
In part b.ii, it was mentioned that a vertical spring is stretched downward and then released. The spring oscillates up and down until it eventually comes to rest in its equilibrium position. Throughout this process, the potential energy of the spring-mass system changes.
At the highest point in the oscillation, when the spring is fully stretched and the mass is at its maximum height, the potential energy of the system is at its maximum. This is because the spring is stretched to its maximum extent, storing potential energy due to its change in shape. As the mass descends and the spring compresses, the potential energy decreases, converting into kinetic energy. At the equilibrium position, the potential energy is at its minimum, as the spring is neither stretched nor compressed.
This example is consistent with the statement because the potential energy change is associated with the change in shape of the spring. The system undergoes internal changes as the spring expands and contracts, resulting in a change in potential energy.
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why does it hurt more to kick a bowling ball than a soccer ball
Answers
The combination of higher mass and lower elasticity in a bowling ball results in a more painful experience when compared to kicking a soccer ball.
Kicking a bowling ball is more painful than kicking a soccer ball because of the differences in their masses and elasticity. The pain experienced when kicking an object is determined by the transfer of kinetic energy and the interaction between the object and the body.
A bowling ball is much heavier and has a higher mass compared to a soccer ball. When you kick a bowling ball, it has a greater amount of momentum, which is the product of mass and velocity. The higher momentum results in a greater force being exerted on your foot upon impact, leading to a higher level of discomfort or pain.
In addition, the elasticity of the objects plays a role. Soccer balls are designed to be more elastic, allowing them to absorb and distribute the impact force more effectively. This elasticity helps to reduce the amount of force transmitted back to your foot, resulting in less pain. On the other hand, bowling balls are typically less elastic, leading to a greater transfer of force and more discomfort when kicked.
Overall, the combination of higher mass and lower elasticity in a bowling ball results in a more painful experience when compared to kicking a soccer ball.
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a(n) ""_______"" is a noninvasive roentgeno/graph/y diagnostic technique.
Answers
Computerized axial tomography is a noninvasive roentgenography diagnostic technique.
What is tomography?Tomography can be described as imaging by sections or sectioning that uses any type of penetrating wave. The method is used in biology, radiology, archaeology, geophysics, atmospheric science, oceanography, plasma physics, astrophysics, materials science, quantum information, and other areas of science.
In some cases, the production of images will be based on the mathematical procedure of tomographic reconstruction, such as X-ray computed tomography being produced from projectional radiographs.
Most algorithms come into these two categories: filtered back projection (FBP) and iterative reconstruction (IR). Optical coherence tomography is transmission methods, they do not require movement of the transmitter to need data from different directions.
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a ball is launched from the ground with a horizontal speed of 30 m/s and a vertical speed of 30 m/s. what is the balls overall speed at the top of its trajectory?
Answers
Answer:
30m/ s
Explanation:
this is an example of a projectile, where the path traced by the ball will be a downward parabola.
one must know that the vertical velocity of an object having projectile motion is zero at the top of its trajectory and that the horizontal velocity remains constant throughout.
this means, at the top of the trajectory the ball's overall speed will be equal to its horizontal velocity.
and horizontal velocity is given 30 m/s
hence, overall speed of the ball = 30m/ s
1. If you move 4 meters north and move 2 meters south what is the distance and the displacement?
2. If you move 2 meters east and move 4 meters west what is the distance and the displacement?
Please help!!It’ll be greatly appreciated
Answers
Answer:
distance will be 6diplacement will be 2
2. distance will be 6
displacement will be 2
The distance if we move 4 meters north and 4 meters south is 6 meters whereas, the displacement is 2 m. The same for the movement of 2 meters east and 4 meters west.
What is distance ?Distance is a physical quantity that measures how far we travelled from rest. It is the total length of the ways we moved. Distance is a scalar quantity. Displacement is a vector quantity showing the distance magnitude as well the direction.
If a person moves equal distances in opposite directions, then the displacement will cancel each other as in the case of force and the net displacement is zero.
Here, if move 4 m north and 2 meters south, the total distance is their sum , i.e., 6 meters. But the displacement for the opposite directions cancel in magnitude and the net displacement is 4-2 = 2 meters.
The same is applied for east and west movement. Hence, the distance is 6 m and displacement is 2 m.
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In an elastic collision, a 480-kg bumper car collides directly from behind with a second, identical bumper car that is traveling in the same direction. The initial speed of the leading bumper car is 4.5 m/s and that of the trailing car is 7.2 m/s.
Hint
Assuming that the mass of the drivers is much, much less than that of the bumper cars, what are their final speeds?
The speed of the leading bumper car after collision is m/s, and the speed of the trailing bumper car after collision is m/s.
Assuming that the total mass of leading bumper car is 35% greater than that of the trailing bumper car, what are their final speeds?
The speed of the leading bumper car (now 35% more massive) is m/s, and the speed of the trailing bumper car after collision is m/s.
Answers
The speed of the leading bumper car after collision is 7.2 m/s and the speed of the trailing bumper car after collision is4.5 m/s
m₁v₁ + m₂v₂ = m₁ v₁ + m₂ v₂ 1eq
0.5 ˣ m₁v₁² + 0.5 ˣ m₂v₂² = 0.5 ˣ m₁v₁² ˣ m₂v₂² 2 eq
From equation 1 and 2 we get ,
v₁ = (m₁ - m₂ / m₁+ m₂) v₁ + ( 2m₂ / m₁ + m₂) v₂
v₂ = (2m₁ / m₁ + m₂) v₁ + ( m₂ -m₁ / m₁+ m₂) v₂
m₁ = m₂
v₁ = v2 = 7.2 m/s
v₂ = v₁ = 4.5 m/ s
b. v₁ = (m₁ - m₂ / m₁ + m₂ )v₁ + (2 m₂ / m₁ + m₂ ) v₂
=( m - 1.35 ₓ m / 2.35 ) ˣ 4.5 + (2 ˣ 1.35 m / 2.35 ) ˣ 7.2
v₁ = (1 - 1.35 / 2.35 ) ˣ 7.2 + (2 ˣ 1.35 / 2.35 ) ˣ 4.5
= 4.098 m/s
v₂= (2m₁ / m₁ + m₂ ) v₁ + ( m₂ - m₁ / m₁+ m₂) v₂
= 2 / 1.35 ˣ 7.2 + 0.35 / 2.35 ˣ 4.5
= 11. 34 m/ s
What is a collision, and what kind is it?
The principal kinds of impacts are as per the following: Strong collisions: Both kinetic energy and momentum are conserved. Inelastic impacts: Momentum alone is preserved. Entirely inelastic crashes: The collision causes the objects to stick to one another because the kinetic energy is lost.
How does collision work?A collision occurs when two objects come into brief contact with one another. At the end of the day, crash is a reciprocative connection between two masses for an extremely short span wherein the force and energy of the impacting masses changes.
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The hydraulic fluid transmits the pressure, caused by piston A, equally to each of the four holding up the car supports. The pressure throughout the fluid is the same. A force of 1000 N on piston A is just enough to raise the car. (a) Using values from Fig. 3.1, find (i) the pressure caused by piston A on the fluid, pressure = [2]
Answers
To find the pressure caused by piston A on the fluid, we can use the formula:
Pressure = Force / Area
Given that the force exerted by piston A is 1000 N, and the area of each of the four pistons that hold up the car is 0.02 m^2, we can calculate the pressure as:
Pressure = 1000 N / (4 x 0.02 m^2)
Pressure = 25000 N/m^2
So the pressure caused by piston A on the fluid is 25000 N/m^2
The recoil (springing or flying back of the gun when shots are fired) momentum of a gun is _______________ the momentum of the bullet it fires.
a. less than
b. more than
c. the same as
d. not equal to
Answers
The recoil (springing or flying back of the gun when shots are fired) momentum of a gun is the same as the momentum of the bullet it fires.
option C is the correct answer.
What is the principle of conservation of linear momentum?
The principle of conservation of linear momentum states that in an isolated system, the sum of the initial momentum of the system is equal to the sum of the final momentum of the system.
Mathematically, the principle of conservation of linear momentum is written as;
Pi = Pf
where;
Pi is the sum of the initial momentum of the systemPf is the sum of the final momentum of the systemm₁u₁ = m₂u₂
where;
m₁ is the mass of the gunu₁ is the initial speed of the gunm₂ is the mass of the bulletu₂ is the final speed of the bulletThus, based on the principle of conservation of linear momentum the final momentum of the gun will always be equal to the final momentum of the bullet.
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Use the simulation to complete the activity.
Force and Motion Basics (select Acceleration)
In one or two sentences, make a hypothesis about whether or not it is easier to start the box moving than to keep it moving on a rough surface. Then, explain how the simulation can be used to prove the hypothesis.
Answers
It is more difficult to get the object to move or keep moving on a rough surface.
What is friction?The term friction has to do with the opposition to the motion of an object. We know that friction could lead to a reduction in the speed of the object. If the surface is so rough, the motion an object would be difficult due to a greater resistive force that keeps the object from moving.
We can then see that it would be more difficult for the object to begin to move on the rough surface rather, motion could easily start and be sustained on quite a smooth surface as we can see.
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On a rough surface, it is more challenging to move or maintain the motion of the object due to friction between the object and the surface due to contact.
What is force?An object experiences a push or pull as a result of interacting with another object. Each object is subject to a force whenever two objects interact.
According to newton's law, an object tries to maintain its position whether it is at resting or it is in motion. If the body is at rest then it tries to maintain its rest position and if the body is in motion then again it tries to maintain its motion. So, if the box is at rest, it is difficult to move the box in starting because of inertia, but once it is in motion it is easy to keep on going with the flow.
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Mr. Ben drove from Town A to Town B. For the first 3 hours, he traveled at an average speed of 60 km/h, and after that, he drove at another average speed of 70 km/h. If the distance between Town A and B is 460 km, what was the total time for the whole journey?
Answers
Answer:
First you calculate the distance covered in First 3hrs then calculate the time for the remaining distance then add the total time
The slit opening is a = 10 mm and the distance between the slit and the screen is L = 3 m. Calculate l for light of wavelength 500 nm.
Answers
The initial maxima speed for light with a 500 nm wavelength is 5 mm/s.
How is the calculation for light diffraction done?Hence, given the distance to a screen, the breadth of the slit, and the wavelength of the light, we can apply the equation y = L l / a to pinpoint the location of the initial diffraction minimum with in single slit diffraction pattern.
Its Type III dispersion is intended for applications such general carparks and streets where a larger illumination area is required. Type III lighting must be placed to one side of the area in order for it to illuminate the entire area. As a result, there's a filling light flow.
According to the given data:Distance between slits and screenD=3m
Distance between slits d=10 mm
Speed v=4 m/s
v β =5×10 −3 m/s
= 5 mm/s
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What is the study of economics?
Answers
Answer:
Economics is the study of how societies use scarce resources to produce valuable commodities and distribute them among different people.
Explanation:
The ultimate goal of economic science is to improve the living conditions of people in their everyday lives.
Hope this helps!
Answer:
the branch of knowledge concerned with the production, consumption, and transfer of wealth. (basically the study of money and not just banks but how it effects the world)
Explanation:
Help please (20 pts) I think it's C
What does "think of concrete examples" mean?
A. It means you come up with as many examples as you can in five minutes.
B. It means your thinking is getting too stiff, like concrete.
C. It means you think about how you can imagine the problem as a concrete block.
D. It means think of a real-life example you can relate to that has to do with what you’re learning.
Answers
Answer:
I'm not sure it is c I'm sure it is d
A 0.48-kg ball is thrown with a speed of 8.8 m/s at an upward angle of 36 degrees.
(a) What is its speed at its highest point?
(b) How high does it go? (Use conversation of energy.)
Answers
Answer: (a) The velocity of the ball at its highest point is 10.12 m/s
(b) The height that the ball goes is 1.13 m.
Mass of ball, m = 0.48 kg
Initial velocity, u = 8.8 m/s
Initial angle, θ = 36°
Using the principle of conservation of energy, the final velocity at the highest point can be found. The potential energy of the ball is converted into kinetic energy at its highest point, where the ball will stop momentarily. Then, we know that the total energy at the top will be equal to the potential energy at the beginning. That is, Initial Potential Energy + Initial Kinetic Energy = Final Potential Energy∴
mgh + 1/2mu² = mgh(max) where h(max) is the maximum height the ball attains. At this point, the kinetic energy will be zero. Therefore,0.5mv² + mgh = mgh(max). Since the kinetic energy of the ball at the top is zero, the total energy at the top of the projectile’s trajectory is the potential energy at the start of the trajectory, which is mgh.∴ v = √(2gh).
This is the velocity at the maximum height.
(a) Speed at its highest point:
Initial velocity of ball, u = 8.8 m/s
Angle made with horizontal, θ = 36°
The vertical component of velocity, v_y = usinθv_y = 8.8 sin 36°v_y = 5.0 m/s
Now using the formula, v = √(u² + v_y²)v = √(8.8² + 5.0²)v = √(77.44 + 25)v = √102.44v = 10.12 m/s
Therefore, the velocity of the ball at its highest point is 10.12 m/s
(b) How high does it go: lets calculate the potential energy at the initial position. Potential energy, Ep = mgh
Ep = 0.48 * 9.8 * 0Ep = 0 J. The total energy at the top will be equal to the potential energy at the beginning. That is, Initial Potential Energy + Initial Kinetic Energy = Final Potential Energy∴ mgh + 1/2mu² = mgh(max). Substituting the values,0.48*9.8*h(max) + 0.5*0.48*8.8² = 0.48*9.8*0hmax = (0.5*0.48*8.8²)/(0.48*9.8)h(max) = 1.13 m.
Therefore, the height that the ball goes is 1.13 m.
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PLEASE HELP!!! WILL MARK BRAINLIEST
Answers
The environmental impact of the changes in the amount of energy resources is reduction in air pollution.
What are energy resources?Energy resources are the materials that can act as sources of energy which is grouped into two namely:
Renewable energy resources: These are energy resources that can easily be replaced by nature. A typical example is the solar energy.Non renewable energy resources: These are energy resources that cannot easily be replaced by nature. Examples include coal, nuclear and gas.From the given figures,
In 2014 renewable energy = 19%; while in 2015 it is = 25%
In 2014 non renewable energy when added = 79%; while in 2015 it is = 73%
This shows that there was reduction in the use of non renewable energy from 2014 to 2015 by 6%.
This would affect the environment positively as there would be reduction in air pollution caused by non renewable energy resources.
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Why is climate change important?
PLEASE HELP! GIVING BRAINLIEST!
Answers
Answer:
Because if we do nothing the artic will melt, ocean levels will rise and cause flooding, the earth will be extremely hotter, there will be more blackouts.
Explanation:
most of the waves in the electromagnetic spectrum are
Answers
Answer:
The entire electromagnetic spectrum, from the lowest to the highest frequency (longest to shortest wavelength), includes all radio waves (e.g., commercial radio and television, microwaves, radar), infrared radiation, visible light, ultraviolet radiation, X-rays, and gamma rays.
Which table correctly identifies the SI units for length, mass, volume, and temperature?
see picture for tables
Answers
Table c correctly identifies the SI units for length, mass, volume, and temperature.
What is volume?Volume is a three-dimensional measurement that's used to gauge a solid shape's capacity. It implies that the volume of a closed form determines how much space it may occupy in three dimensions.
Mass is conservative in nature. The law of conservation of mass states that the overall mass of substances that remarkably take part in a chemical reaction is conserved during the reaction. It is neither created nor destroyed in a chemical reaction.
SI unit of mass Kilogram. SI unit of temperature is in Kelvin. SI unit of length is meter.
Table c correctly identifies the SI units for length, mass, volume, and temperature.
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the length breadth and height of an object are 20 cm 15 cm 25 cm.find the volume and density
Answers
Complete Question:
The length, breadth and height of an object are 20 cm, 15 cm and 25 cm respectively. Its mass is 7 kg. Find its volume and density
Answer:
a. Volume of cuboid = 7500 cm³
b. Density = 0.000933 Kg/cm³
Explanation:
Given the following data;
Length = 20 cmBreadth = 15 cmHeight = 25 cmMass = 7 kga. To find the volume of the object.
An object that has a length, breadth and height is a cuboid.
Mathematically, the volume of a cuboid is given by the formula;
Volume of cuboid = length * breadth * height
Substituting into the formula, we have;
Volume of cuboid = 20 * 15 * 25
Volume of cuboid = 7500 cm³
b. To find the density of the object;
Density can be defined as mass all over the volume of an object.
Simply stated, density is mass per unit volume of an object.
Mathematically, density is given by the formula;
\( Density = \frac {mass}{volume} \)
Substituting into the formula, we have;
\( Density = \frac {7}{7500} \)
Density = 0.000933 Kg/cm³
9
8
7
VELOCITY (M/S)
Xena
- Gabrielle
2
1
0
0
10
20
30
40
50
TIME (5)
Was Xena and Gabrielle accelerating?
Answers
Answer:
6
Explanation:
cause logic
Is hunting good for the environment
Answers
Answer:
yes but no
Explanation:
if there weren't carnivorous animals then there would be overpopulation of animals but since there are maybe no
6. Selena stretches a rubber band across a box and lets it go. What is produced?
1)Electrical energy
2)Magnetic energy
3)Sound waves
4)Light waves
Answers
3)Sound waves
good luck!
The current in a light bulb is 0. 835A. How long does it take for a total charge of 1. 67 C to pass a point in the wire
Answers
It takes 2 seconds for the charge to pass a point in the wire. The result is obtained by using the formula for an electric current equation.
What is electric current?Electric current is a flow of charged particles per unit of time. It can be expressed as
I = Q/t
Where
I = electric current (A)Q = charge (C)t = time (s)A light bulb has
Electric current, I = 0.835 A.Total charge, Q = 1.67 C.Find the time taken!
We use the formula above to find t.
I = Q/t
0.835 = 1.67/t
t = 1.67/0.835
t = 2 s
Hence, the time needed to for the charge to pass a point in the wire is 2 seconds.
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You discover a binary star system in which one member is a15 solar mass main-sequence star and the other star is a 10 solar mass giant star. How do we believe that a star system such as this might have come to exist?
Answers
Answer:
yes
Explanation:
Mass of block A above is 25-kg. Calculate the force of gravity on block A.
Answers
Answer:w+mg
Explanation:
PLEASE HELP ASAP
In this diagram you see a wave. B is at the high point of the wave; D is at the low point in the wave. A, D, and E are located where the wave crosses the t-axis.
Which letter represents the trough of the wave?
Answers
Explain what the following statement means: "Similar to the moon, Mercury and Venus have phases when seen from Earth. "
Please use full sentences
Answers
Being informed that the planets Mercury and Venus, in addition to the Moon, also have phases is one of the joys of studying astronomy. The mechanics underlying the phases as well as the visual experience on these planets are somewhat different.
We observe the phases of these two planetary disks because of the varying position angle between the Earth, Sun, Mercury, and Venus caused by the relative positions of our orbits to one another. When Venus lies between the Earth and the Sun, it appears as a thin crescent in telescopic views as it rotates to the near side. When Venus is far from the Sun, it displays its new phase. The planet may be observed through a telescope at first light because it has an atmosphere.
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The work done in raising an object must result in an increase in the object's A. internal energy B. kinetic energy C. gravitational potential energy D. heat energy
Answers
The work done in raising an object results in an increase in the object's gravitational potential energy.option C.
Gravitational potential energy is the energy possessed by an object due to its position relative to a reference point in a gravitational field. When an object is raised, work is done against the force of gravity, and the object gains potential energy as a result.To understand this, let's consider the formula for gravitational potential energy: PE = mgh, where PE represents potential energy, m is the mass of the object, g is the acceleration due to gravity, and h is the height or distance the object is raised.When the object is lifted to a higher position, h increases, resulting in an increase in potential energy. This increase in potential energy is equivalent to the work done on the object against gravity.
The object stores this energy, which can be released or converted into other forms of energy later.The other options, such as internal energy, kinetic energy, and heat energy, are not directly affected by the act of raising an object against gravity. Internal energy refers to the total energy of the object's microscopic particles, kinetic energy is associated with the object's motion, and heat energy is the transfer of energy due to temperature differences. In the context of raising an object, these forms of energy may not necessarily change unless there are other factors involved.option C.
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A Tale f Two Elephants
1. what organisms are shown?
2. Do they look the same?
3. Do the pictures show the same species?
4. How are they similar?
5. How are they different?
Answers
Answer:
u need it now?
Explanation:
I'll answer it
Based on the diagram above, the organisms that are shown are elephants.
What is a species?A species simply refers to a biological classification of related organisms that have the same (similar) characteristics and they are capable of mating (breeding) with one another in a cycle (different seasons).
Based on the diagram above, we can logically deduce that the organisms shown are species of elephants and they look similar due to the following points:
They both have a single tail.They both have ears.They both have four legs.They both have tusk.However, an obvious difference between them is the number of tusk.
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