When bullets are fired from an airplane in the forward direction, the momentum of the airplane is
A) decreased.
B) unchanged.
C) increased.
Answer: A
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In an x-ray tube, high-speed electrons are slammed into a lead target, giving off x-rays. If the electrons are accelerated from rest through a potential difference of 160 000 volts, what speed do they have when they strike the target? (qe = 1.6 × 10^?19 C, me = 9.11 × 10^?31 kg, and c = 3.00 × 10^8 m/s)
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