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Question
A loaded gun is dropped on a frozen lake. The gun fires, with the bullet going horizontally in one direction and the gun sliding on the ice in the other direction. The bullet’s mass is 0.04 kg, and its speed is 305 m/s. If the gun’s mass is 1.9 kg, what is its speed (in m/s)?
Question
On a highway curve with radius 44 m, the maximum force of static friction (centripetal force) that can act on a 1,223-kg car going around the curve is 8,127 N. What speed limit should be posted for the curve so that cars can negotiate it safely?
Question
A bicycle and rider going 13 m/s approach a hill. Their total mass is 84 kg.
(a) What is their kinetic energy?
(b) If the rider coasts up the hill without pedaling, how high above its starting level will the bicycle be when it finally rolls to a stop?
Question
The cliff divers at Acapulco, Mexico, jump off a cliff 21.7 m above the ocean. Ignoring air resistance, how fast are the divers going when they hit the water?
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