According to __________, _______________ motion occurs when natural motion has to be sustained by a force
Fill in the blank(s) with correct word
Aristotle; violent
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You discover a binary star system in which one star is a 15 MSun main-sequence star and the other is a 10 MSun giant. How do we think that a star system such as this might have come to exist?
A) The giant must once have been the more massive star, but it is now less massive because it transferred some of its mass to its companion. B) Although both stars probably formed from the same clump of gas, the more massive one must have had its birth slowed so that it became a main-sequence stars millions of years later than its less massive companion. C) The two stars probably were once separate, but became a binary when a close encounter allowed their mutual gravity to pull them together. D) The two stars are simply evolving normally and independently, and one has become a giant before the other.
Suppose that you measure the parallax angle for a particular star to be 0.5 arcseconds. What is the distance to this star?
A) 0.5 light-year B) 0.5 parsec, which is about 1.63 light-years C) 5 light-years D) 5 parsecs, which is about 16.3 light-years E) 2 parsecs, which is about 6.52 light-years
An electric clothes dryer draws 10 A at 220 V. If the clothes put into the dryer have a mass of 10 kg when wet and 3 kg dry, about how long does it take to dry the clothes? (Assume all heat energy goes into vaporizing water, Lv = 2.26 × 10^6 J/kg)
a. 171 min b. 120 min c. 51 min d. 40 min e. 5 min
Before the switch is closed in the figure, the potential across the capacitor is 200 V. At some instant after the switch is closed, the instantaneous current is 0.70 A. What is the energy in the capacitor at this instant?
a.
49 mJ
b.
31 mJ
c.
80 mJ
d.
0.13 J
e.
62 mJ