Energy in the Electric Field: At a distance d from a point charge Q, the energy density in its electric field is u. If we now go to a distance d/2 from the charge, what is the energy density at the new location?
A. 16u
B. 8u
C. 4u
D. 2u
E. u
Answer: A
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A ball of mass mB is released from rest and acquires velocity of magnitude vB before hitting the ground. The ratio of the impulse delivered to the Earth to the impulse delivered to the ball is
A.
B.
.C.
.D.
E.
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