Using dimensional analysis, which one of the following equations is dimensionally correct? ( a ? m/s2, v ? m/s, x ? m , t ? s)
A) x = v/t
B) v = 2ax
C) t2 = x/a
D) x2 = 2av
E) x = a t
C
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When the speed of your car is doubled, by what factor does its kinetic energy increase?
(a) square root of 2 . (b) 2. (c) 4. (d) 8.
State the law of the conservation of mechanical energy
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You observe two distant galaxies (well outside our Local Group of galaxies). You find that Galaxy W is moving away from us at a speed of 35,000 km/s and Galaxy X is moving away from us at a speed of 70,000 km/s. What can you say about the distances to those galaxies?
A) Galaxy W is four times as far as Galaxy X. B) Galaxy W is twice as far as Galaxy X. C) She can't say anything about the distances to Galaxy W or X. D) Galaxy X is four times as far as Galaxy W. E) Galaxy X is twice as far as Galaxy W.
Mars is often called a "midway world," similar in some respects to Earth, and in others to our Moon. Explain
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