Questions from Modern Physics

Q: A slingshot will shoot a 10-g pebble 22.0

A slingshot will shoot a 10-g pebble 22.0 m straight up. (a) How much potential energy is stored in the slingshot’s rubber band? (b) With the same potential energy stored in the rubber band, how high...

Q: Is it possible for a friction force to increase the mechanical energy

Is it possible for a friction force to increase the mechanical energy of a system? If so, give examples.

Q: A woman holding a large rock stands on a frictionless, horizontal

A woman holding a large rock stands on a frictionless, horizontal sheet of ice. She throws the rock with speed v0 at an angle a above the horizontal. Consider the system consisting of the woman plus t...

Q: In Example 8.7 (Section 8.3), where

In Example 8.7 (Section 8.3), where the two gliders of Fig. 8.18 stick together after the collision, the collision is inelastic because K2 < K1 . In Example 8.5 (Section 8.2), is the collision inelast...

Q: (a) A book is lifted upward a vertical distance of

(a) A book is lifted upward a vertical distance of 0.800 m. During this displacement, does the gravitational force acting on the book do positive work or negative work? Does the gravitational potentia...

Q: (a) A block of wood is pushed against a spring

(a) A block of wood is pushed against a spring, which is compressed 0.080 m. Does the force on the block exerted by the spring do positive or negative work? Does the potential energy stored in the spr...

Q: A 1.0­kg stone and a 10.0

A 1.0­kg stone and a 10.0­kg stone are released from rest at the same height above the ground. Ignore air resistance. Which of these statements about the stones are true? Justify each answer. (a) Both...

Q: Two objects with different masses are launched vertically into the air by

Two objects with different masses are launched vertically into the air by placing them on identical compressed springs and then releasing the springs. The two springs are compressed by the same amount...

Q: In Fig. 8.23b, the kinetic energy of the

In Fig. 8.23b, the kinetic energy of the Ping-Pong ball is larger after its interaction with the bowling ball than before. From where does the extra energy come? Describe the event in terms of conserv...

Q: A box slides down a ramp and work is done on the

A box slides down a ramp and work is done on the box by the forces of gravity and friction. Can the work of each of these forces be expressed in terms of the change in a potential ­ energy function? F...