The electron-volt is a unit of
A) charge.
B) electric potential.
C) electric field.
D) electric force.
E) energy.
E
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A stone is thrown with an initial speed of 15 m/s at an angle of 53° above the horizontal from the top of a 40-m building. If g = 9.8 m/s2 and air resistance is negligible, then what is the speed of the rock as it hits the ground?
a. 30 m/s c. 34 m/s b. 32 m/s d. 36 m/s
All of the following statements are true. Which one explains the reason why there is not a solar eclipse at every new moon?
A) The nodes of the Moon's orbit precess with an approximately 18-year period. B) The orbital plane of the Moon is tilted by about 5° to the ecliptic plane. C) The Moon rotates synchronously with its orbit around Earth. D) The Moon's orbital period is slightly shorter than the time it takes for a cycle of phases. E) The Moon's orbital distance varies as it orbits around Earth.
"Gibbous" means a nearly full moon. If I see a waxing gibbous moon tonight, what moon phase will I see in one week?
A) waxing crescent B) waxing gibbous C) waning gibbous D) waning crescent
Compared to a 1-kg block of solid iron, a 2-kg block of solid iron has twice as much
A) inertia. B) mass. C) volume. D) all of the above E) none of the above