Questions from Modern Physics

Q: For a person wearing these shoes, what’s the maximum angle (

For a person wearing these shoes, what’s the maximum angle (with respect to the horizontal) of a smooth rock that can be walked on without slipping? (a) 42°; (b) 50°; (c) 64°; (d) larger than 90°.

Q: If the person steps onto a smooth rock surface that’s inclined at

If the person steps onto a smooth rock surface that’s inclined at an angle large enough that these shoes begin to slip, what will happen? (a) She will slide a short distance and stop; (b) she will acc...

Q: A person wearing these shoes stands on a smooth, horizontal rock

A person wearing these shoes stands on a smooth, horizontal rock. She pushes against the ground to begin running. What is the maximum horizontal acceleration she can have without slipping? (a) 0.20g;...

Q: A large box containing your new computer sits on the bed of

A large box containing your new computer sits on the bed of your pickup truck. You are stopped at a red light. When the light turns green, you stomp on the gas and the truck accelerates. To your horro...

Q: A 5.60-kg bucket of water is accelerated upward

A 5.60-kg bucket of water is accelerated upward by a cord of negligible mass whose breaking strength is 75.0 N. If the bucket starts from rest, what is the minimum time required to raise the bucket a...

Q: You have just landed on Planet X. You release a 100

You have just landed on Planet X. You release a 100-g ball from rest from a height of 10.0 m and measure that it takes 3.40 s to reach the ground. Ignore any force on the ball from the atmosphere of t...

Q: Two adults and a child want to push a wheeled cart in

Two adults and a child want to push a wheeled cart in the direction marked x in Fig. P4.33. The two adults push with horizontal forces F S 1 and F S 2 as shown. (a) Find the magnitude and direction of...

Q: An oil tanker’s engines have broken down, and the wind is

An oil tanker’s engines have broken down, and the wind is blowing the tanker straight toward a reef at a constant speed of 1.5 m/s (Fig. P4.34). When the tanker is 500 m from the ree...

Q: A nonzero net force acts on an object. Is it possible

A nonzero net force acts on an object. Is it possible for any of the following quantities to be constant: the object’s (a) speed; (b) velocity; (c) kinetic energy?

Q: Basketball player Darrell Griffith is on record as attaining a standing vertical

Basketball player Darrell Griffith is on record as attaining a standing vertical jump of 1.2 m (4 ft). (This means that he moved upward by 1.2 m after his feet left the floor.) Griffith weighed 890 N...