Questions from Modern Physics

Q: Find the magnitude of the angular momentum of the second hand on

Find the magnitude of the angular momentum of the second hand on a clock about an axis through the center of the clock face. The clock hand has a length of 15.0 cm and a mass of 6.00 g. Take the secon...

Q: (a) Calculate the magnitude of the angular momentum of the

(a) Calculate the magnitude of the angular momentum of the earth in a circular orbit around the sun. Is it reasonable to model it as a particle? (b) Calculate the magnitude of the angular momentum of...

Q: A hollow, thin-walled sphere of mass 12.0

A hollow, thin-walled sphere of mass 12.0 kg and diameter 48.0 cm is rotating about an axle through its center. The angle (in radians) through which it turns as a function of time (in seconds) is give...

Q: A small block on a frictionless, horizontal surface has a mass

A small block on a frictionless, horizontal surface has a mass of 0.0250 kg. It is attached to a massless cord passing through a hole in the surface (Fig. E10.40). The block is originally revolving at...

Q: Under some circumstances, a star can collapse into an extremely dense

Under some circumstances, a star can collapse into an extremely dense object made mostly of neutrons and called a neutron star. The density of a neutron star is roughly 1014 times as great as that of...

Q: A diver comes off a board with arms straight up and legs

A diver comes off a board with arms straight up and legs straight down, giving her a moment of inertia about her rotation axis of 18 kg.m2. She then tucks into a small ball, decreasing this moment of...

Q: The outstretched hands and arms of a figure skater preparing for a

The outstretched hands and arms of a figure skater preparing for a spin can be considered a slender rod pivoting about an axis through its center (Fig. E10.43). When the skater’s han...

Q: A solid wood door 1.00 m wide and 2.

A solid wood door 1.00 m wide and 2.00 m high is hinged along one side and has a total mass of 40.0 kg. Initially open and at rest, the door is struck at its center by a handful of sticky mud with mas...

Q: A 4.0-m-long steel wire has a

A 4.0-m-long steel wire has a cross-sectional area of 0.050 cm2. Its proportional limit has a value of 0.0016 times its Young’s modulus. Its breaking stress has a value of 0.0065 times its Young’s mod...

Q: A steel cable with cross-sectional area 3.00 cm2

A steel cable with cross-sectional area 3.00 cm2 has an elastic limit of 2.40 × 108 Pa. Find the maximum upward acceleration that can be given a 1200-kg elevator supported by the cable if the stress i...