# hw7 - kveton(ajk643 – hw7 – morrison –(60620 1 This...

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Unformatted text preview: kveton (ajk643) – hw7 – morrison – (60620) 1 This print-out should have 22 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 10.0 points A car is moving at 71 miles per hour. The kinetic energy of that car is 5 × 10 5 J. How much energy does the same car have when it moves at 111 miles per hour? Answer in units of J. 002 10.0 points Calculate the speed of an 7 . × 10 4 kg airliner with a kinetic energy of 1 . 3 × 10 9 J. Answer in units of m / s. 003 10.0 points The Joule and the kilowatt-hour are both units of energy. 9 . 9 kW · h is equivalent to how many Joules? Answer in units of J. 004 10.0 points If you exert a force of 20 N to lift a box a distance of 0 . 83 m, how much work do you do? Answer in units of J. 005 10.0 points A block moves to the right in the positive x- direction through the displacement Δ x while under the influence of a force with the same magnitude F . Which of the following is the correct order of the amount of work done by force F , from most positive to most negative? (a) vector F (b) vector F (c) vector F (d) vector F 1. c, a, b, d 2. c, a, d, b 3. a, b, c, d 4. d, c, a, b 5. d, a, b, c 6. a, d, b, c 7. a, c, b, d 006 10.0 points A skier of mass 70.0 kg is pulled up a slope by a motor-driven cable. How much work is required to pull the skier 63.0 m up a 30.0 ◦ slope (assumed to be fric- tionless) at a constant speed of 2.0 m/s? The acceleration of gravity is 9 . 81 m / s 2 ....
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hw7 - kveton(ajk643 – hw7 – morrison –(60620 1 This...

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