Which quantity can be converted from the English system to the metric system by the conversion factor 
?
A. feet per second
B. feet per hour
C. miles per second
D. miles per hour
E. miles per minute
Answer: D
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a. heavy elements (molten rock and iron). b. helium. c. hydrogen. d. heavy elements (molten rock and iron) and helium.
The proper motion of a star, its distance, and Doppler shift can give us its space velocity
Indicate whether the statement is true or false
A ball is projected upward at time t = 0 s, from a point on a flat roof 90 m above the ground. The ball rises and then falls with insignificant air resistance, missing the roof, and strikes the ground. The initial velocity of the ball is 80.5 m/s
Consider all quantities as positive in the upward direction. The vertical velocity of the ball when it is above the ground is closest to A) -81 m/s. B) -64 m/s. C) -48 m/s. D) -32 m/s. E) -97 m/s.
The characteristic peaks in an x ray spectrum of an atom occur because
a. of photon absorption b. of the photoelectric effect c. electrons in the atom make transitions to lower energy levels d. of the uncertainty principle e. of rapid deceleration of the bombarding electrons