Two soldiers are marching side by side with a speed of 1.9 m/s, but one of them moves 92 cm for each step he takes, while the other moves only 84 cm. How often are they in step?
A) every 3.2 s
B) every 8.7 s
C) every 4.6 s
D) every 5.1 s
E) every 10 s
E
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Resistance and Resistivity: How much current will be flowing through a 57.0-m length of copper wire with radius 5.7 mm if it is connected to a source supplying 62.0 V? The resistivity of the metal is 1.68 × 10-8 ? ? m.
A. 6600 A B. 37 × 108 A C. 190 nA D. 3900 A
An object is moving with constant non-zero velocity on the +x axis. The position versus time graph of this object is
A) a horizontal straight line. B) a vertical straight line. C) a straight line making an angle with the time axis. D) a parabolic curve. E) a hyperbolic curve.
What might have made the original solar nebula begin to contract?
A) the Big Bang B) the formation of our arm of the Milky Way C) the shock wave from a nearby exploding star D) interstellar magnetism generated by pulsars E) the large amount of angular momentum in the nebula
Power is defined as the rate of work per time, power = work/time. If the dimensions of power are [ML2T-3], what are the dimensions of work?
A) [MLT-3] B) [ML2T-1] C) [ML3T-3] D) [ML2T-2] E) [ML2T-4]