Which one of the following units is the correct SI unit for the electromotive force (emf)?
a) newtons (N)
b) coulombs (C)
c) joules (J).
d) amperes (A)
e) volts (V)
Answer: e) volts (V)
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When the Moon is directly opposite the Sun in the sky, its phase is
A) first or third quarter. B) waxing or waning gibbous. C) new. D) full. E) waxing or waning crescent.
Atmospheric pressure at an altitude of 10,000 m is exactly half of what it is at 5,000 m
Indicate whether the statement is true or false
If you watched the history of the universe like a movie playing backward, what would you see?
A. Objects getting farther apart. B. The Universe becoming denser. C. The temperature of the Universe decreasing. D. Regions of space becoming smaller. E. More than one of the above.
Gravitational Force: When a spacecraft is launched from the earth toward the sun, at what distance from the earth will the gravitational forces due to the sun and the earth cancel?Earth's mass is 5.97 × 1024 kg, the sun's mass is 1.99 × 1030 kg, and the Earth-sun distance is 1.5 × 1011 m.
A. 1.3 × 108 m B. 2.6 × 108 m C. 1.3 × 1010 m D. 2.6 × 1010 m