A ball with diameter 10. cm rolls without slipping on a horizontal table top. The moment of inertia of the ball is 2.2 × 10-3 kg-m2 and its translational speed is 0.45 m/s
(a) What is its angular speed about its center of mass?
(b) What is its rotational kinetic energy?
(c) What is its angular momentum?
(a) 9.0 rad/s
(b) 0.089 J
(c) 0.020 J ? s
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According to the second law of thermodynamics, for any process that may occur within an isolated system, which answer applies?
A. entropy remains constant. B. entropy increases. C. entropy decreases. D. depends on the rate of change of the process.
Landforms created by glacial erosion include
A) hanging valleys, cirques, and drumlins. B) cirques, drumlins, and roches moutonnees. C) eskers, kettle lakes, and hanging valleys. D) hanging valleys, cirques, and roches moutonnees.
Two coins, each with a Head and a Tail, are tossed randomly onto a table. The microstate is defined as the "number of Heads showing". The number of Heads can be, 0, 1, 2. What value for the "number of Heads showing" has the greatest number of microstates?
A. 0 B. 1 C. 2
Pressure: When a heavy metal block is supported by a cylindrical vertical post of radius R, it exerts a force F on the post. If the diameter of the post is increased to 2R, what force does the block now exert on the post?
A. F/4
B. F/2
C. F/
D. F
E. 2F