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
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]
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.