At the moment of a total eclipse, the moon lies along a line from the Earth to the Sun. If your normal weight is 600 N, how much is your weight decreased by the combined pull of the Sun and Moon? MSun = 2.0 × 10^30 kg, rS-E = 1.5 × 10^8 km MMoon = 7.4 × 10^22 kg, rM-E = 3.8 × 10^5 km
0.37 N
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The supernova event for a massive star that has lost a large amount of mass to a close binary companion ____
a. does not show hydrogen emission lines in the spectrum of the remnant b. does not produce iron in the core before the explosion c. is less luminous because the companion star absorbs most of the remnant material d. is more likely to produce a neutron star than an isolated supernova e. triggers a supernova in the binary companion
Thermal efficiency (non-Carnot) is
A) Q/T. B) Q/m. C) 1 – Qcold/Qhot. D) Q - W. E) 1 - Tcold/Thot.
A boy and a girl are riding a merry-go-round which is turning at a constant rate. The boy is near the outer edge, while the girl is closer to the center. Who has the greater tangential acceleration?
A) the boy B) the girl C) Both have the same non-zero tangential acceleration. D) Both have zero tangential acceleration. E) There is not enough information given to answer the question.
When the number of turns in a solenoid and its length are both doubled, the ratio of the magnitude of the new magnetic field inside to the magnitude of the original magnetic field inside is what?
a. 0.25 b. 0.50 c. 1 d. 2 e. 4