You ride on an elevator that is moving with constant upward acceleration while standing on a bathroom scale. The reading on the scale is
A)
equal to your true weight, mg.
B)
more than your true weight, mg.
C)
less than your true weight, mg.
D)
zero.
E)
could be more or less than your true weight, mg, depending on the magnitude of the acceleration.
B
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What happens during the apparent retrograde motion of a planet?
A) The planet rises in the west and sets in the east. B) The planet appears to move westward with respect to the stars over a period of weeks to months. C) The planet moves backward through the sky over the course of a night. D) The planet moves backward in its orbit around the Sun. E) The planet moves through constellations that are not part of the zodiac.
X-rays are similar to
A) alpha rays. B) beta rays. C) gamma rays. D) all of the above E) none of the above
How fast would a rocket have to move past a ground observer if the latter were to observe a 9.4% length shrinkage in the rocket length? (c = 3.00 × 10^8 m/s)
a. 2.98 × 10^8 m/s b. 2.72 × 10^8 m/s c. 1.27 × 10^8 m/s d. 0.420 × 10^8 m/s e. 0.920 × 10^8 m/s
Ball A is dropped from rest as ball B is shot out horizontally. Ball A hits the ground
1) before ball B. 2) after ball B. 3) at the same time as ball B. This is because 4) ball A has less distance to travel. 5) ball B is acted upon by an additional force. 6) both balls fall the same vertical distance with the same acceleration.