A disk of radius r 9 cm is pulled along a friction less, Ask an Expert

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Q1. A pinball machine launches a 139 g ball with a spring-driven plunger. The game board is inclined at 6 above the horizontal.

Suppose: The plungers mass and frictional effects are negligible. The acceleration of gravity is 9.8 m/s2.

Discover the force constant k of the spring that will give the ball a speed of 108 cm/s when the plunger is released from rest with the spring condensed 5 cm from its relaxed position.

Q2. A disk of radius R = 9 cm is pulled along a friction less surface with a force of F = 15 N by a string wrapped around the edge. At the instant when d = 28 cm of string has unwound off the disk, what is torque exerted about the center of the disk?

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