Which of the following statements about the Moon is not correct?
A. The acceleration due to gravity on the Moon is weaker than on Earth.
B. Earth's gravitational pull on the Moon equals the Moon's gravitational pull on Earth.
C. There is a net force acting on the Moon.
D. The Moon is not accelerating.
Answer: D. The Moon is not accelerating.
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When a rainbow is seen as a complete circle from an airplane, the airplane's shadow is
A) in the center of the rainbow. B) in the lower part of the rainbow. C) in the upper part of the rainbow. D) totally outside the rainbow. E) nowhere, for there is no shadow.
A 25.0-V potential source (a battery) is connected across the plates of a 6.66-µF air-filled parallel-plate capacitor having plates that are 1.22 mm apart. What energy density does it produce between the plates? (?0 = 8.85 × 10-12 C2/N ? m2)
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If the current in a wire is halved, what effect does this have on the electron drift velocity in the wire?
a. It decreases by a factor of two. c. It stays the same. b. It increases by a factor of four. d. It doubles.