Physics 1401 - Exam 2 Chapter 5N-New

Physics 1401 - Exam 2. Chapter 5N-New 2. The second hand on a watch has a length of mm and makes one revolution in s. What is the speed of the end of the second hand as it moves in uniform circular motion? (a) 10-4 m/s (c) 10-3 m/s (e) 10-5 m/s (b) 10-3 m/s (d) 10-4 m/s 3. Approximately one billion years ago, the Moon orbited the Earth much closer than it does today. The radius of the orbit was only 24 400 km. Today, the radius is 385 000 km. The orbital period was only 23 400 s. The present period is 106 s. Assume that the orbit of the Moon is circular. Calculate the ratio of the speed of the Moon in its ancient orbit to the speed that it has today. (a) (c) (e) (b) (d) 5. A ball is whirled on the end of a string in a horizontal circle of radius R at constant speed v. The centripetal acceleration of the ball can be increased by a factor of 4 by (a) keeping the speed fixed and increasing the radius by a factor of 4. (b) keeping the radius fixed and increasing the speed by a factor of 4.

15. In an amusement park ride, a small child stands against the wall of a cylindrical room that is then made to rotate. The floor drops downward and the child remains pinned against the wall. If the radius of the device is 2.15 m and the relevant coefficient of friction between the child and the wall is 0.400, with what minimum speed is the child

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  Park, Ride, Amusement, Amusement park ride

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