Chrome File Edit View History Bookmarks People Window Help 98% Tue 5:32 PM a U.S

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Chrome File Edit View History Bookmarks People Window Help 98% Tue 5:32 PM a U.S O WA Chapter 3 C www.webassign.net 1354060 /web/Student/Assignment-Responses/last?dep Total Question 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 -1 -1 -1 -1 -3 -1 -1 -1 -1 -1 -2 -2 -2 -1 -3 -2 -2 -1 -3 -2 -1 133 (0.0% Points Assignment submission For this assignment, you submit answers by question parts. The number of submissions remaining for each question part only changes if you submit or change the answer. Assignment Scoring Your last submission is used for your score 19. 13 points OBInPhys7 3. P.035 My Notes 1,575 steps to a height of 1,050 ft. In 2003, Australian Paul Crake completed n the annual Empire State Building race, contestants run up the race in a record time of 9 min and 33 s. Mr. Crake weighed 143 lb (65 kg (a) How much work did Mr. Crake do in reaching the top of the building? (b) What was his average power output (in ft-lb/s and in hp)? power in ft-lb/s ft-lb/s power in hp Need Help? Read t Submit Answer View Previous Question Question 19 of 21 View Next Question

Explanation / Answer

a) work done w=F*d =m*g*h =65*9.81*(1050*12*2.54*10^-2 =204073.506J

b) Power outpot P=F*V =W/t =143*32.174*1050/573 =8430.935lb.ft/s

Power outpot P=F*V =W/t =204073.506J/(9*60+33) =356.15W

1hp =746W =>P (in hp) =356.15/746 =0.4774hp

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