A locomotive is pulling 9 freight cars, each of which is loaded with the same weight. The mass of each loaded car is 37000kg and we can neglect friction on these 9 cars. If the train is accelerating forward at 0
81m/s2 on a level track, what is the tension in the coupling between the second and third cars? (The car nearest the locomotive is counted as the first car.)
210,000 N
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A sound wave radiates from a source in all directions. If the power of the sound source is 200 watts, then the intensity level of the sound wave 100 m from the source is (in dB)
A. 98.5. B. 92.0. C. 91.5. D. 89.6. E. 88.3.
At first, the Sun's present-day rotation seems to contradict the prediction of the nebular theory because
A) the theory predicts that the axis of rotation should not be perpendicular to the orbital plane of the planets, but it is. B) the axis of rotation precesses slowly, which the theory does not predict. C) the present-day rotation is in the opposite direction from that predicted by the theory. D) the theory predicts that the Sun should have been rotating fast when it formed, but the actual rotation is fairly slow. E) the theory predicts that the Sun should not have been rotating when it formed, but the Sun actually rotates today.
The de Broglie wavelength of which of the following objects would be smallest if the objects all had the same momentum?
A water rocket, launched from the ground, rises vertically with acceleration of 20 m/s2 for 1.0 s when it runs out of "fuel.". Disregarding air resistance, how high will the rocket rise?
a. 15 m c. 61 m b. 30 m d. 102 m