What is an example of the conservation of angular momentum?
a. A volleyball player serves a ball and it follows a parabolic path.
b. A baseball player strikes the ball with the bat
c. A cross-country skier accelerates as she moves in a straight line
d. A skateboarder maintains the same velocity in the same direction
e. A diver brings his arms and legs closer to his body
e
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When a boxer hits a punching bag, the strength of his punch depends on how much force the bag can
A) endure. B) exert on the boxer's fist. C) soften.
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.)
Studies by the Global Oscillations Network Group, along with satellite observations, indicate
A) that the standard solar model requires substantial modification. B) that all stars show the same kind of vibrations that our Sun does. C) that there is an unknown energy transport mechanism in the Sun. D) that there is less convection in the Sun than predicted by the standard solar model. E) that the standard solar model accurately models the observed solar vibrations.
At temperatures above the equi-cohesive temperature, the crystalline areas are _________than the grain boundaries.
Fill in the blank(s) with the appropriate word(s).