Mechanics | Relativity Answers

A milk carton with a mass of 2.00 kg is pulled across a table with a horizontal force of 3.00 N. If the coefficient of friction is 0.110, the magnitude of acceleration of the milk carton is ___m/s2.

For a 60 kg mass, if the frictional force is 40 N, the magnitude of the applied force required to accelerate the object at 4.0 m/s2 is ___x102 N.

Two people, A and B are pulling on a tree with ropes while person C is cutting the tree down. Person A applies a force of 80.0 N [45.0°] on one rope. Person B applies a force of 90.0 N [345°] on the other rope. Calculate the net force on the tree?

An engine provides 5.0 kN of force to keep a 1600-kg vehicle moving at a uniform speed. (Air resistance is negligible.) The coefficient of rolling friction between the tires and the road surface is ___.

If the coefficient of friction is 0.30, the horizontal force needed to pull a mass of 15 kg across a level board with constant velocity is ____N.

Four pendulums A, B, C and D are suspended from the same

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elastic support as shown in fig. A and C are of the same length, while B is smaller than A and D is larger than A. If A is given a transverse displacement,
(1) D will vibrate with maximum amplitude.
(2) C will vibrate with maximum amplitude.
(3) B will vibrate with maximum amplitude.
(4) All the four will oscillate with equal amplitude.

These questions consist of two statements each, printed as Assertion and Reason. While answering these Questions you are required to choose any one of the following four responses.

A. If both Assertion and Reason are True and the Reason is a correct explanation of the Assertion.
B. If both Assertion and Reason are True but Reason is not a correct explanation of the Assertion.
C. If Assertion is True but the Reason is False
D. If both Assertion and Reason are false.

Assertion :- The potential energy of a particle varies with distance x as shown in figure. The force acting on the particle is zero at points C and E.

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Reason :- Potential energy is defined only for conservative force field.
(1) A (2) B (3) C (4) D

The coefficient of static friction between a book and the level surface it slides on is 0.65. If the mass of the book is 2.0 kg, the minimum initial applied force required to slide the books across the surface is ___N.

A squirrel with an armful of nuts is sliding helplessly across a flat, icy roof, getting dangerously close to the edge. He understands Newton's Third Law, and is able to save himself. Explain how he does it?

An impulse is supplied to a moving object with the force at an angle of 120º with the velocity vector. What is the angle between the impulse and change in momentum ?
(1) 0º (2) 30º (3) 60º (4) 120º