Questions from College Physics

Q: If an object is in equilibrium, which of the following statements

If an object is in equilibrium, which of the following statements is not true? (a) The speed of the object remains constant. (b) The acceleration of the object is zero. (c) The net force acting on the...

Q: A large crate of mass m is placed on the back of

A large crate of mass m is placed on the back of a truck but not tied down. As the truck accelerates forward with an acceleration a, the crate remains at rest relative to the truck. What force causes...

Q: A woman is standing on the Earth. In terms of magnitude

A woman is standing on the Earth. In terms of magnitude, is her gravitational force on the Earth (a) Equal to, (b) Less than, or (c) Greater than the Earth’s gravitational force on her?

Q: Choose the best answer. A car traveling at constant speed has

Choose the best answer. A car traveling at constant speed has a net force of zero acting on it. (a) True (b) False (c) The answer depends on the motion.

Q: A boy coasts down a hill on a sled, reaching a

A boy coasts down a hill on a sled, reaching a level surface at the bottom with a speed of 7.00 m/s. If the coefficient of friction between the sled’s runners and the snow is 0.050 0 and the boy and s...

Q: Three objects are connected by light strings as shown in Figure P4

Three objects are connected by light strings as shown in Figure P4.78. The string connecting the 4.00-kg object and the 5.00-kg object passes over a light frictionless pulley. Determine (a) The accele...

Q: A box rests on the back of a truck. The coefficient

A box rests on the back of a truck. The coefficient of static friction between the box and the bed of the truck is 0.300. (a) When the truck accelerates forward, what force accelerates the box? (b) Fi...

Q: A ball is thrown upward in the air by a passenger on

A ball is thrown upward in the air by a passenger on a train that is moving with constant velocity. (a) Describe the path of the ball as seen by the passenger. Describe the path as seen by a stationar...

Q: A high diver of mass 70.0 kg steps off a

A high diver of mass 70.0 kg steps off a board 10.0 m above the water and falls vertical to the water, starting from rest. If her downward motion is stopped 2.00 s after her feet first touch the water...

Q: A frictionless plane is 10.0 m long and inclined at

A frictionless plane is 10.0 m long and inclined at 35.0°. A sled starts at the bottom with an initial speed of 5.00 m/s up the incline. When the sled reaches the point at which it momentarily stops,...