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Unformatted text preview: constant speed by an applied force of 120N exerted at an angle of 30.0˚ above the horizontal. Find (a)the net work done on the laundry bag, (b)the work done by the applied force on the laundry bag, and (c)the work done by the frictional force on the laundry bag. v r F a 30˚ 3.00m Physics 4A SECOND EXAM Chapters 1 - 8 Fall 1998 3 4. A 250g block is dropped onto a vertical spring with a spring constant of 5.00N/cm. The block attaches to the spring and drops 15.0cm more before coming to rest. Find the speed of the block just as it hits the spring. 5. Every month Pacific Gas & Electric Company sends me a bill for the energy I “used.” As a physicist I find their choice of words to be irritating because I still have to pay the bill! Explain why I object to paying for the energy I “used” and explain what I am really paying for. h = 15.0cm v = 0 before o v after...
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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