The density of air in the previous question would be __________ the density at the surface.
a. one-third
b. one-half
c. three times
d. four times
Answer: c. three times
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(e) A particle of mass 2m at rest decays to two identical particles each of mass m that move in opposite directions away from the decay position at a speed of 0.5.
A. C B. F
Two forces act on a object. One force has magnitude 65 N directed 59° clockwise from the positive x-axis, and the other has a magnitude 35 N at 32° clockwise from the positive y-axis. What is the magnitude of this object's acceleration?
A) 1.1 m/s2 B) 1.3 m/s2 C) 1.5 m/s2 D) 1.7 m/s2
A 5000-kg freight car moving at 2 m/s collides with a 10,000-kg freight car at rest. They couple upon collision and move away at
A) 2 m/s. B) 1 m/s. C) 2/3 m/s. D) 1/3 m/s.
A factory siren indicating the end of a shift has a frequency of 90.0 Hz
(a) What frequency is perceived by the occupant of a car traveling towards the factory at 25 m/s? (b) What frequency is perceived by the occupant of a car traveling away from the factory at 30 m/s?