The unit called the hertz (Hz) is equivalent to
a. 1/s only.
b. a reciprocal second only.
c. s-1 only.
d. all of these.
d
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The hang time of an athlete who moves horizontally 2.0 m during a 1.25-m-high jump is
A) less than 1 s. B) about 1 s. C) more than 1 s.
In an RL circuit, which of the following is a possible magnitude of a phase angle?
a. 45° b. 315° c. 225° d. 135°
The energy per photon in ultraviolet light is greater than in
A) radio waves. B) microwaves. C) visible light. D) all of the above E) none of the above
Planet A has twice the mass of Planet B. From this information, what can we conclude about the acceleration due to gravity at the surface of Planet A compared to that at the surface of Planet B?
A) The acceleration due to gravity on Planet A is greater than the acceleration due to gravity on Planet B, but we cannot say how much greater. B) The acceleration due to gravity on Planet A must be four times as great as the acceleration due to gravity on Planet B. C) The acceleration due to gravity on Planet A must be twice as great as the acceleration due to gravity on Planet B. D) The acceleration due to gravity on Planet A is the same as the acceleration due to gravity on Planet B. E) We cannot conclude anything about the acceleration due to gravity on Planet A without knowing the radii of the two planets.