About how many times more luminous than our Sun is a young solar mass protostar just beginning convective contraction?
A) 2-5
B) 5-10
C) 10-100
D) 100-1000
E) a million
C
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The heliocentric model of the solar system gained preference over the early Greek epicycle model because
A. the heliocentric model was simpler. B. only the heliocentric model could explain retrograde motion. C. the heliocentric model gave a more accurate description of observed planetary motions.
Except Venus and Uranus, all the other planets:
A) rotate in the counterclockwise direction as seen from the north. B) revolve around their moons with their equators almost perpendicular to their orbits as seen from the north. C) revolve around the Sun in the clockwise direction as seen from the north. D) rotate on their sides with their equators almost perpendicular to their orbits as seen from the north.
The first-quarter Moon rises
a. at about noon. b. at sunset. c. at sunrise. d. at about midnight. e. during the second week of each calendar month.
A 9.00-µF and a 12.0-µF capacitor are connected together, and this combination is connected across a 25.0-V potential difference. How much electric energy is stored in the combination if they are connected (a) in parallel or (b) in series?
What will be an ideal response?