1) Long-playing vinyl records, still used by club DJs, are 12inches in diameter
ID: 1681957 • Letter: 1
Question
1) Long-playing vinyl records, still used by club DJs, are 12inches in diameter and are played at 33 1/3 revolutions per minute.What is the speed (in m/s) of a point on the edge on such a record?2) Consider the radius of the Earth to be 6.38×106m. What is the magnitude of the centripetal accelerationexperienced by a person (a) at the equator and (b) at the NorthPole due to the Earth's rotation?
3) You are playing tetherball with a friend and hit theball so that it begins to travel in a circular horizontal path. Ifthe ball is 1.2 meters from the pole, has a speed of 3.7 m/s, amass of 0.42 kilograms, and its (weightless) rope makes a 49°angle with the pole, find the tension force that the rope exerts onthe ball just after you hit it.
2) Consider the radius of the Earth to be 6.38×106m. What is the magnitude of the centripetal accelerationexperienced by a person (a) at the equator and (b) at the NorthPole due to the Earth's rotation?
3) You are playing tetherball with a friend and hit theball so that it begins to travel in a circular horizontal path. Ifthe ball is 1.2 meters from the pole, has a speed of 3.7 m/s, amass of 0.42 kilograms, and its (weightless) rope makes a 49°angle with the pole, find the tension force that the rope exerts onthe ball just after you hit it.
Explanation / Answer
radius r = 6 inches = 0.1524 m, = 33 1/3 rev/min = 100/3 *2/60 rad/s find v v = r = 0.532 m/s
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