An object is moving in a straight line with constant acceleration. Initially it is traveling at 16 m/s. Three seconds later it is traveling at 10 m/s. How far does it move during this time?
A) 30 m
B) 39 m
C) 48 m
D) 57 m
B
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You need an inductor that will store 20 J of energy when a 3.0-A current flows through it. What should be its self-inductance?
A) 4.4 H B) 90 H C) 3.7 H D) 60 H
To initiate star formation in a cloud, you need a __________
a. slow contraction of a molecular cloud b. rotating molecular cloud c. magnetic field d. shock
Compared to young stars, very old stars have
A) exactly the same chemical composition B) a lower proportion of elements heavier than helium C) a higher proportion of elements heavier than helium D) no elements heavier than helium at all
Suppose that, for some unknown reason, the core of the Sun suddenly became hotter and the rate of nuclear fusion thereby increased. What would happen next?
A) The Sun would quickly run out of hydrogen, causing the temperature to return to its original value. B) The rate of fusion would almost instantly skyrocket, causing the Sun to explode. C) The temperature would continue to increase, causing higher and higher fusion rates. D) The core would expand, reducing the pressure and temperature, and the rate of fusion would decrease until it returned to its original level.