What happens to its moment of inertia when a steel disk is heated?
a. It increases.
b. It decreases.
c. It stays the same.
d. It increases for half the temperature increase and then decreases for the rest of the temperature increase.
A
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A 2.00-kg solid sphere of radius 5.00 cm rolls down a 20.0° inclined plane starting from rest
(a) What is the magnitude of the acceleration of the center of mass of the sphere? (b) How far down the plane does it roll without slipping in 1.00 s?
Case 1: An electron is released from rest in a uniform electric field. Case 2: A proton is released from rest in a uniform electric field of the same magnitude as in case 1 . How does the electric potential energy of the charge-field system behave in these cases?
a. In case 1 the potential energy increases, but in case 2 it decreases. b. In both cases, the potential energy increases. c. In case 1 the potential energy decreases, but in case 2 it increases. d. In both cases, the potential energy decreases.
If the Sun were twice as massive
A) its pull on the Earth would double. B) Earth's pull on the Sun would double. C) both of these D) none of the above
A thin uniform rod (length = 1.2 m, mass = 2.0 kg) is pivoted about a horizontal, frictionless pin through one end of the rod. (The moment of inertia of the rod about this axis is ML2/3.) The rod is released when it makes an angle of 37° with the horizontal. What is the angular acceleration of the rod at the instant it is released?
a. 9.8 rad/s2 b. 7.4 rad/s2 c. 8.4 rad/s2 d. 5.9 rad/s2 e. 6.5 rad/s2