Reactance: A 0.200-H inductor is connected to a 60.0-Hz 120-V rms source.(a) What is the inductive reactance?(b) What is the rms current to the inductor?(c) If both the inductance and the frequency were doubled, what would be the rms current?
What will be an ideal response?
(a) 75.4 ? (b) 1.59 A (c) 0.398 A
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How many zodiacal constellations are there?
A. 24 B. 88 C. 13 D. 12
When Freddy Frog drops vertically from a tree onto a horizontally-moving skateboard, the speed of the skateboard
A) decreases. B) increases. C) neither decreases nor increases.
Two identical silver spheres of mass m and radius r are placed a distance R (sphere 1) and 2R (sphere 2) from the sun respectively. The ratio of the pressure of solar radiation on sphere 2 to that on sphere 1 is
a. 0.25. b. 0.50. c. 1.0. d. 2.0. e. 4.0.
What advantages come from putting a telescope in space?
a. wavelengths of light that do not penetrate Earth’s atmosphere can be seen b. images may be sharper, without moving air to blur them c. you are closer to the stars, for a better view d. all of the above e. a and b