Question

question 21 please

Suppose the rules were changed in Question 19 so that the teams pushed for a fixed time of 5 seconds rather than a fixed distance of 5 meters. Compare the momen- tum of the light sled to that of the others after 5 seconds Compare the kinetic energy of the light sled to that of the others after 5 seconds. (Hint: Think about the distances involved.) 21. The tractor of an 18-wheeler performs work on its trailer when the truck is traveling along a level highway with a constant velocity. Why doesn't the trailer continually gain kinetic energy-that is, continually speed up? y 22. The Chandra X-ray satellite orbits Earth in a highly ellip tical orbit, as shown in the following figure. The force that Earth exerts on the satellite is always directed toward Earth. Is the satellite's kinetic energy increasing, decreas- ing, or staying the same at each of the points indicated? r reasoning (Nate: The velocity vectors on t

Answer 1

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