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15. [1/2 Points] DETAILS PREVIOUS ANSWERS OSCOLPHYS2016 7.8.P.056. The swimmer shown in the figure exerts an average horizontal backward force of 90.0 N with his arm during each 1.80 m long stroke. 1.8 m- (a) What is his work output (in 3) in each stroke? 162 J (b) Calculate the power output (in W) of his arms if he does 110 strokes per minute. 378 xw T Additional Materials Reading 16. [2/2 Points] DETAILS PREVIOUS ANSWERS OSCOLPHYS2016 7.8.P.047. fal What is the efficiency of an nutuol.condition professor who does 2.00 x 1051 of useful work while Q MY NOTES MY NOTES zabalizina 500 kcal of food anend NES ASK YOUR TEACHER P ASK YOUR TEACHER PRACTICE
good physical condition can put out 100 W of useful power for several hours at a stretch, perhaps by pedaling a mechanism that drives an electric generator, Neglecting any problems of generator efficiency and practical considerations such as resting time, answer the following. (a) How many people would it take to run a 2.00 kW electric clothes dryer? 20 ✔people (b) How many people would it take to replace a large electric power plant that generates 500 MW? 2 X people Additional Materials Reading
7. [-/1 Points] DETAILS OSCOLPHYS2016 7.3.P.019. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER In Example 7.7 we found the speed of a roller coaster that had descended 25.0 m was only slightly greater when it had an initial speed of 6.00 mys than when it started from rest. This implies that APEKE, Confirm this statement by taking the ratio of APE to KE, (Note that mass cancels) APE KE + <- 360 Addonal Materials Reading St Answer Vewing Saved Work Beve Last Respo ALE TAP.022 MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER