An electron is accelerated through 100 kV. By what factor has its mass increased with respect to its rest mass?
A)
1.20
B)
1.55
C)
4.25
D)
6.50
E)
8.00
A
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The Sun is at one focus of the elliptical orbit of the Earth aroundthe Sun. What is atthe other focus?
a) Nothing. b) The Earth. c) Mars. d) The Moon. e) Jupiter.
A quasar's spectrum is hugely redshifted. What do most astronomers think this large redshift tells us about the quasar?
A) the composition of the quasar B) the distance to the quasar C) the size of the quasar's central, supermassive black hole D) the type of host galaxy in which the quasar resides
Significant Figures: Using a digital balance the mass of a certain piece of wood is read as 12.946 g. Thinking in terms of accuracy and significant figures, what value would you record on your data sheet if the balance is accurate to one-tenth of a gram?
A. 12.9 g B. 12.95 g C. 13 g D. 13.0 g
Where is the center of mass of a binary system consisting of two stars with different masses?
A) the center of the more massive star B) the center of the less massive star C) the point halfway in between the two stars D) a point between the two stars that is closer to the more massive star E) a point between the two stars that is closer to the less massive star