Question
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In movies there are frequently scenes where the one person shoots another. The "shooter" is standing, but the person getting hit goes flying backwards from the impact. Use conservation of momentum to argue that such a scene is "pure Hollywood", and not realistic at all.To measure pitching speed without a radar gun, a little league coach has his pitchers throw baseballs into a bucket that hangs from a couple of ropes. The bucket swings up, and the height "h" the bucket reaches indicates the speed with which the ball was moving (see figures at right).A baseball weighs 5 oz. The bucket has a mass of 2 kg. How high will the bucket swing when a baseball enters it at 50 mph? If it swings to twice the 50 mph height how fast is the pitch?A small mass sets atop a larger, sloped mass as shown in the figure below. The two masses together have a mass of 100 kg. All surfaces are well-lubricated (no significant friction).¦>o The small mass slides down the slope where it is measured to be moving at 1.25m/s to the left and to have a mass of 20 kg. The large mass is moving to the right. What is the height of the large mass?
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