A ball is rolling along the floor. It is rolling toward the east, and slowing down as it rolls. As the ball rolls,
A) the net force on it is toward the west.
B) its velocity is toward the west.
C) Both of the above.
D) the net force on it is zero.
E) the net force on it is toward the east.
A
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Indicate whether the statement is true or false
Energy and Momentum: In a certain nuclear reactor, neutrons suddenly collide with carbon nuclei, which have 12 times the mass of neutrons. In a head-on elastic collision with a stationary carbon nucleus, what fraction of its initial speed does the neutron have after the collision?
A. 11/12 B. 1/12 C. 11/13 D. 5/6 E. 10/13
A same-size iron ball and wooden ball are dropped simultaneously from a tower and reach the ground at the same time. The iron ball has a greater
A) speed. B) acceleration. C) momentum. D) all of the above E) none of the above
With no air resistance a projectile fired horizontally maintains its horizontal component of velocity because
A) no forces act on it. B) no horizontal forces act on it. C) of no initial vertical component of velocity. D) all of the above E) none of the above