Questions from College Physics

Q: For each of the situations given, state whether frictional forces do

For each of the situations given, state whether frictional forces do positive, negative, or zero work on the italicized object. (a) A plate slides across a table and is brought to rest by friction. (b...

Q: An object of mass m moves to the right with a speed

An object of mass m moves to the right with a speed υ. It collides head-on with an object of mass 3m moving with speed υ/3 in the opposite direction. If the two objects stick together, what is the spe...

Q: A 70 - kg base runner begins his slide into second base

A 70 - kg base runner begins his slide into second base when he is moving at a speed of 4.0 m/s. The coefficient of friction between his clothes and Earth is 0.70. He slides so that his speed is zero...

Q: Two stones, one with twice the mass of the other,

Two stones, one with twice the mass of the other, are thrown straight up and rise to the same height h. Compare their changes in gravitational potential energy (choose one): (a) They rise to the same...

Q: A 7.80 - g bullet moving at 575 m/

A 7.80 - g bullet moving at 575 m/s penetrates a tree trunk to a depth of 5.50 cm. (a) Use work and energy considerations to find the average frictional force that stops the bullet. (b) Assuming the f...

Q: Mark and David are loading identical cement blocks onto David’s pickup truck

Mark and David are loading identical cement blocks onto David’s pickup truck. Mark lifts his block straight up from the ground to the truck, whereas David slides his block up a ramp on massless, frict...

Q: A large cruise ship of mass 6.50 x 107 kg

A large cruise ship of mass 6.50 x 107 kg has a speed of 12.0 m/s at some instant. (a) What is the ship’s kinetic energy at this time? (b) How much work is required to stop it? (c) What is the magnitu...

Q: A certain truck has twice the mass of a car. Both

A certain truck has twice the mass of a car. Both are moving at the same speed. If the kinetic energy of the truck is K, what is the kinetic energy of the car? (a) K/4 (b) K/2 (c) 0.71K (d) K (e) 2K...

Q: A 0.20 - kg stone is held 1.3

A 0.20 - kg stone is held 1.3 m above the top edge of a water well and then dropped into it. The well has a depth of 5.0 m. Taking y = 0 at the top edge of the well, what is the gravitational potentia...

Q: A car accelerates uniformly from rest. Ignoring air friction, when

A car accelerates uniformly from rest. Ignoring air friction, when does the car require the greatest power? (a) When the car first accelerates from rest, (b) Just as the car reaches its maximum speed,...