An object is dropped from rest on the planet Jupiter. At the end of 1 second, it has fallen 8 m and is moving at 16 m/s. At the end of two seconds the object's speed will be
A) 64 m/s.
B) 48 m/s.
C) 16 m/s.
D) 32 m/s.
E) None of the above.
D
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A car is traveling with a constant speed when the driver suddenly applies the brakes, giving the car a deceleration of 3.50 m/s2. If the car comes to a stop in a distance of 30.0 m, what was the car's original speed?
A) 10.2 m/s B) 14.5 m/s C) 105 m/s D) 210 m/s E) 315 m/s
How far must one travel to escape Earth's gravitational field?
A) to a region above Earth's atmosphere B) to a region well beyond the Moon C) to a region beyond the solar system D) forget it; you can't travel far enough.
The experiment, which gave the first evidence for the existence of the atomic nucleus, involved which of the following?
a. x-ray scattering b. radioactive dating c. cosmic ray detection d. alpha scattering
According to Einstein’s theory of special relativity, a stationary observer measures
A. a shorter length of an object than a moving observer measures B. a longer length of an object than a moving observer measures C. the same length of an object than a moving observer measures