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Unformatted text preview: luzon (jrl2375) HW7 Liu (80440) 1 This print-out should have 23 questions. Multiple-choice 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 kilowatt-hour, how much does it cost to run the compressor each day? Answer in units of cents. 005 10.0 points The Joule and the kilowatt-hour 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