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Unformatted text preview: luzon (jrl2375) HW7 Liu (80440) 1 This printout should have 23 questions. Multiplechoice questions may continue on the next column or page find all choices before answering. This assignment is due at 9:00PM, Monday, Oct.12, 2009. 001 (part 1 of 2) 10.0 points Assume your mass is 64 kg. The acceleration due to gravity is 9 . 8 m / s 2 . How much work against gravity do you do when you climb a flight of stairs 3 . 3 m high? Answer in units of J. 002 (part 2 of 2) 10.0 points Consider the energy consumed by a 60 W light bulb in an hour. How many flights of stairs would you have to climb to equal the work of the lightbulb? 003 (part 1 of 2) 10.0 points A small air compressor operates on a 1 . 6 hp (horsepower) electric motor for 8 . 6 hours a day. How much energy is consumed by the motor daily? 1 hp equals about 750 watts. Answer in units of J. 004 (part 2 of 2) 10.0 points If electricity costs 10 cents per kilowatthour, how much does it cost to run the compressor each day? Answer in units of cents. 005 10.0 points The Joule and the kilowatthour are both units of energy. 12 . 5 kW h is equivalent to how many Joules? Answer in units of J. 006 (part 1 of 3) 10.0 points A block of mass m is pushed a distance D up an inclined plane by a horizontal force F . The plane is inclined at an angle with respect to the horizontal. The block starts from rest and the coefficient of kinetic friction is k ....
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 Spring '08
 KUMAR
 Physics

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