Per9_exercise

# Per9_exercise - Period 9 Exercises E.1 Joe weighs 900 N He runs up a flight of steps in 3 seconds and stops on a landing a distance of 2 meters

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Period 9 Exercises E.1 Joe weighs 900 N. He runs up a flight of steps in 3 seconds and stops on a landing a distance of 2 meters above ground level. How much power did Joe supply in doing work against gravity while climbing the stairs? a) 37.5 watts b) 600 watts c) 1350 watts d) 2160 watts e) 3600 watts E pot = M g h = 900 N x 2 m = 1,800 J P = E = 1,800 J = 600 J/s = 600 W t 3 s E.1 = b 9-Ex 1

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E.2 Suppose you climb a 10 ft. stairway in 3 seconds and then you climb a 20 ft. stairway in 6 seconds. Which of the following statements about the work done against the force of gravity and the power required for this work is TRUE? a) You used twice as much energy and required twice as much power to climb the 20 ft. stairway as you did to climb the 10 ft. stairway. b) You used twice as much energy but required the same amount of power to climb the 20 ft. stairway as you did to climb the 10 ft. stairway. c)
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## This note was uploaded on 06/11/2011 for the course PHYSICS 103 taught by Professor Staff during the Spring '10 term at Ohio State.

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Per9_exercise - Period 9 Exercises E.1 Joe weighs 900 N He runs up a flight of steps in 3 seconds and stops on a landing a distance of 2 meters

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