A 4.00 kg solid sphere of radius 5.00 cm starts from rest and rolls without slipping down a 30.0 degree incline. The acceleration of the center of mass of the solid sphere is
A. 1.50 
B. 2.00
C. 2.50
D. 3.00
E. 3.50
E. 3.50
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A 10-pound sack of potatoes falls from an airplane. As the velocity of the falling sack increases, so does the air resistance on it. When the air resistance equals 10 pounds, the acceleration of the sack will be
A. zero. B. 9.8 m/s. C. 9.8 m/s2. D. 100 ft/s2.
Which planet (besides Earth) has been visited by the largest number of robotic spacecraft?
A) Mars B) Venus C) Jupiter D) Saturn
Order the following from most recent to least. I. Big Bang II. Age of quasars III. First humans IV. Cambrian explosion V. Formation of the solar system VI. First life VII. Recombination Period
a. I, II, VII, IV, V, VI, III b. I, VI, VII, II, V, IV, III c. I, VI, V, VII, III, II, IV d. I, VII, II, V, VI, IV, III
Enzo throws a rock horizontally with a speed of 12 m/s from a bridge. It falls for 2.28 s before reaching the water below with no appreciable air resistance. Just as the rock reaches the water, find
(a) the horizontal component of its velocity. (b) the speed with which it is moving.