Questions from College Physics

Q: The two rigid objects shown in Figure 8.21 have the

The two rigid objects shown in Figure 8.21 have the same mass, radius, and angular speed, each spinning around an axis through the center of its circular shape. If the same braking torque is applied t...

Q: Atmospheric pressure varies from day to day. The level of a

Atmospheric pressure varies from day to day. The level of a floating ship on a high-pressure day is (a) Higher, (b) Lower, or (c) No different than on a low-pressure day.

Q: Two astronauts (Fig. P8.80), each having a

Two astronauts (Fig. P8.80), each having a mass M, are connected by a rope of length d having negligible mass. They are isolated in space, moving in circles around the point halfway between them at a...

Q: Two window washers, Bob and Joe, are on a 3

Two window washers, Bob and Joe, are on a 3.00-m-long, 345-N scaffold supported by two cables attached to its ends. Bob weighs 750 N and stands 1.00 m from the left end, as shown in Figure P8.82. Two...

Q: A 2.35-kg uniform bar of length ℓ =

A 2.35-kg uniform bar of length â„“ = 1.30 m is held in a horizontal position by three vertical springs as in Figure P8.83. The two lower springs are compressed and exert upward forces...

Q: A light rod of length 2L is free to rotate in a

A light rod of length 2L is free to rotate in a vertical plane about a frictionless pivot through its center. A particle of mass m1 is attached at one end of the rod, and a mass m2 is at the opposite...

Q: Many aspects of a gymnast’s motion can be modeled by representing the

Many aspects of a gymnast’s motion can be modeled by representing the gymnast by four segments consisting of arms, torso (including the head), thighs, and lower legs, as in Figure P8...

Q: A uniform thin rod of length L and mass M is free

A uniform thin rod of length L and mass M is free to rotate on a frictionless pin passing through one end (Fig. P8.47). The rod is released from rest in the horizontal position. (a) What is the speed...

Q: A uniform solid cylinder of mass M and radius R rotates on

A uniform solid cylinder of mass M and radius R rotates on a frictionless horizontal axle (Fig. P8.87). Two objects with equal masses m hang from light cords wrapped around the cylinder. If the system...

Q: A painter climbs a ladder leaning against a smooth wall. At

A painter climbs a ladder leaning against a smooth wall. At a certain height, the ladder is on the verge of slipping. (a) Explain why the force exerted by the vertical wall on the ladder is horizontal...