12,726 Answered Questions for the topic physics

Physics

10/26/23

upon hearing of superman's train pushing adventures, ironman decides he can't be outdone. Ironman finds an abandoned train (m=5400kg) and pushes it with a force of 4000 N, until the speeds up to 5m/s.
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Physics

10/26/23

Monument & Energy│Please Help!
A 140 kg fullback is running with the football at 10 m/s. A 70 kg defender runs at him in the opposite direction at 5 m/s. The defender wraps his hands around the fullback. What is the velocity of... more
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Physics

10/26/23

Monument & Energy│Please Help!
Two students are standing face to face on a frozen pond. The left student has a mass of 100 kg and the right student has a mass of 50 kg. If they push off each other what will be true? The right... more
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Physics

10/26/23

Monument & Energy│Please Help!

A 2 kg ball moves to the right at 4 m/s towards a 4 kg ball that is at rest. After the collision, the 2 kg ball is at rest. What is the velocity of the 4 kg ball after the collision? 2 m/s to the... more
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Physics

10/26/23

How to solve the problem?

A bench that is 3.5 m long has a mass of 100 kg. It is supported at the left end by a wooden post. The right post is 2.0 m from the right end of the bench. A 200 N person sits 1.0 m from the right... more
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Physics

10/25/23

Need help with rotational kinematics and energy

A 2.40 kg disc 1.10 m in diameter is rolling to the right without slipping on a horizontal floor at a steady 2.70 rad/s. I found how fast the center of mass was moving which was 1.49 m/sb. What is... more
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Physics

10/25/23

How much work is done on the block between its release at height h and its ascent to its next maximum height?
A block is released from rest, at a height h, and allowed to slide down an inclined plane. There is friction on the plane. At the bottom of the plane, there is a spring that the block will... more
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Physics

10/25/23

20. What is the net work done on the elevator during the entire trip, from the first floor to the fourth floor?
An elevator of mass m is initially at rest on the first floor of a building. It moves upward, and passes the second and third floors with a constant velocity, and finally stops at the fourth floor.... more
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Physics

10/24/23

How much work was done in lifting the crate from the ground to its final position?
A crate is lifted vertically 1.5 m and then held at rest. The crate has weight 100 N (i.e., it is supported by an upward force of 100 N). How much work was done in lifting the crate from the ground... more
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Physics

10/24/23

Find the work done by the force on the particle. Answer in units of J.
A force F~ = Fx ˆı + Fy ˆ acts on a particle that undergoes a displacement of ~s = sx ˆı + sy ˆ where Fx = 1 N, Fy = −2 N, sx = 5 m, and sy = 3 m. Find the work done by the force on the particle.... more
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Physics

10/24/23

What is the mass of the continent? Answer in units of kg
The current theory of the structure of the Earth, called plate tectonics, tells us that the continents are in constant motion. Assume that the North American continent can be represented by a slab... more
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Physics

10/24/23

What is Shawn’s kinetic energy? Answer in units of J.
Shawn and his bike have a total mass of 43.6 kg. Shawn rides his bike 1.2 km in 11.1 min at a constant velocity. The acceleration of gravity is 9.8 m/s 2 .What is Shawn’s kinetic energy? Answer in... more
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Physics

10/24/23

How far will the car skid with locked brakes at 112.5 km/h? Assume that energy loss is due only to sliding friction. Answer in units of m.
This question is typical on some driver’s license exams: A car moving at 45 km/h skids 12 m with locked brakes. How far will the car skid with locked brakes at 112.5 km/h? Assume that energy loss... more
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Physics

10/23/23

Calculate the gravitational attraction between a proton of mass 1.67 x 10^−27kg and an electron of mass 9.11 x 10^−31kg if they are 5 x 10^−11m apart.

Your work must be clear to read. Clearly label all cases (a, b). Show all steps in GRASS format. GRASS means given/required/analysis/solution/statement. You can type your solutions and answers, but... more
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Physics

10/22/23

Calculate the magnitude of its acceleration in a vertical takeoff from the Moon in meters per square second, assuming the acceleration due to gravity on the Moon is 1.67 m/s^2.
Suppose the mass of a fully loaded module in which astronauts take off from the Moon is 12500 kg. The thrust of its engines is 29500 N.
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10/22/23

Where is ChatGPT useful? Where is it not useful?
Where is ChatGPT useful?Where is it not useful?
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Physics

10/22/23

Invariance of speed of light in vacuum
Prove that speed of light in vacuum is Lorentz invariant
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Physics

10/21/23

This problem has two parts to answer. Therefore, the question for each of the parts, and additional info, will be typed in "Description".
A farmer is using a rope and pulley to lift a bucket of water from the bottom of a well. The farmer uses a force F1 = 45.5 N to pull the bucket of water upwards at a constant speed. The bucket,... more
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Physics

10/20/23

This question has two parts to it. I will type the questions for both parts, along with additional info in "Description".
A car with a mass m = 1190 kg is moving at a speed s = 22.2 km/h and needs to stop in a distance d = 41.3 m.Part a) Write an expression for the magnitude of the net force on the car as it is... more
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Physics

10/20/23

This problem has two parts to it. I will be typing the questions for both parts and other info in "Description"
When the moon is directly overhead at sunset, the gravitational force on the Moon due to Earth, FEM, is perpendicular to the gravitational force on the Moon due to the Sun, FSM. These two forces... more
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Physics

10/20/23

I Don't Know How to Solve This Physics Problem
Compare the kinetic energy of a 22,000 kg truck moving at 105 km/h with that of an 83.0 kg astronaut in orbit moving at 28,000 km/h.The final answer should have the equation: KEtruck/KEastronaut... more
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Physics

10/20/23

Solve this Physics Problem
In an inclined plane, the mass of block 1 is m1 = 3.0 kg, while the mass of block 2 is m2 = 6.0 kg. The coefficient of friction between m1 and the inclined surface is 𝜇k = 0.41. The inclined... more
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Physics

10/20/23

Solve This Physics Problem
Three diagrams (one with variable F, the other two with variables F and the angle 𝜃) show a block of mass m being pulled or pushed at constant acceleration along a table with a force F. The... more
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Physics

10/19/23

HW QUESTION-I HAVE BEEN STUMPED FOR DAYS! PLEASE HELP DUE TONIGHT!
An impala is an African antelope capable of a remarkable vertical leap. In one recorded leap, a 45 kgkg impala went into a deep crouch, pushed straight up for 0.21 ss, and reached a height of... more
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Physics

10/19/23

HW QUESTION-PLEASE HELP!

When you bend your knee, the quadriceps muscle is stretched. This increases the tension in the quadriceps tendon attached to your kneecap (patella), which, in turn, increases the tension in the... more
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