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Unformatted text preview: Fall 1992 2 3. A 40.0kg box is at rest on a rough floor. A force of 100N is exerted on it for a distance of 4.00m. The box is now moving at 3.50m/s. Find (a)the change in kinetic energy of the box, (b)the net work done on the box, (c)the work done on the box by the 150N force, (d)the work done on the box by friction, and (e)the frictional force. 4. A child on a swing passes through the lowest point of the motion with a speed of 5.00m/s. Find the height of the child above the lowest point when the speed drops to (a)2.50m/s and (b)0m/s. Physics 4A SECOND EXAM Chapters 1 - 8 Fall 1992 3 5. A 'matchbox' car must negotiate a loop-the-loop. The loop has a radius of 20.0cm. Assume no friction. Find (a)the minimum speed that the car must have at the top of the loop and (b)the minimum height above the bottom of the loop that the car must be released from to gain this speed....
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This note was uploaded on 03/11/2012 for the course PHYSICS 204A taught by Professor Kagan during the Fall '09 term at CSU Chico.
- Fall '09