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Problem 1 Problem 2 Problem 3 Problem 4 Problem 5 Problem 6 Problem 7 Problem 8 Problem 9 Problem 10 Problem 11 Problem 12 Problem 13 Problem 14 Problem 15 Problem 16 Problem 17 Problem 18 Problem 19 Problem 20 Problem 21 Problem 22 Problem 23 Problem 24 Problem 25 Problem 26 Problem 27 Problem 28 Problem 29 Problem 30 Problem 31 Problem 32 Problem 33 Problem 34 Problem 35 Problem 36 Problem 37 Problem 38 Problem 39 Problem 40 Problem 41 Problem 42 Problem 43 Problem 44 Problem 45 Problem 46 Problem 47 Problem 48 Problem 49 Problem 50 Problem 51 Problem 52 Problem 53 Problem 54 Problem 55 Problem 56 Problem 57 Problem 58 Problem 59 Problem 60 Problem 61 Problem 62 Problem 63 Problem 64 Problem 65 Problem 66 Problem 67 Problem 68 Problem 69 Problem 70 Problem 71 Problem 72 Problem 73 Problem 74 Problem 75 Problem 76 Problem 77 Problem 78 Problem 79 Problem 80 Problem 81 Problem 82 Problem 83 Problem 84 Problem 85 Problem 86 Problem 87 Problem 88 Problem 89 Problem 90 Problem 91 Problem 92 Problem 93 Problem 94 Problem 95 Problem 96 Problem 97 Problem 98 Problem 99 Problem 100 Problem 101 Problem 102 Problem 103 Problem 104 Problem 105 Problem 106

Problem 89 Hard Difficulty

$\bullet$ $\bullet$ In creating his definition of horsepower, James Watt, the
inventor of the steam engine, calculated the power output of a
horse operating a mill to grind grain or cut wood. The horse
walked in a 24 -ft diameter circle, making, according to Watt,
144 trips around the circle in an hour. (a) Using the currently
accepted value of 746 watts for 1 horsepower, calculate the
force (in pounds) with which Mr. Watt's horse must have been
pulling. (See Appendix D for useful conversion factors.)
(b) Calculate the power output, in hp, of a 70 -kg human being
who climbs a 3.0 -m-high set of stairs in 5.0 seconds.

Answer

a) 184 $\mathrm{lb}$
b) 0.55 $\mathrm{hp}$

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Video Transcript

problem it, innit? This problem is about about the unit of power are spoiled one HB Is it going toe? 746 words. It is given that the horse off. Mr James Watt completed 1 44 Sir Gilles in one hour. That is hideous off the circle is well fit. Does we can write radius or circular? Well, Oh, three point 65 meters. Now we have to calculate the force with which horse is pulling the mill by the formula power. We know power is called to work done upon time taken. And can we do tennis? Total displacement in tow boards. Upon time. The total distance covered by the horse in 1 44 complete circles is one board floored in Toto. Bye in tow. Three Fine. Six three. This is the total distance into force by one hour or 3600 seconds. And this is equal to one horsepower or 746 words. When we solve this, we will get that's equals. Yeah. One three new guns, which is equal to 1 82 0.9. Phone pose? No. For the second part of the question, we have to calculate the power off a 70 kg human when he climbs by three meters in five seconds. The power he's given us total work and in climbing, which is equal to increase in his potential energy that this m g at bye be now plugging in the glove given values we can earn 70 in tow 9.8 which is the value of X elation Duty gravity Indo three Bye. Why thus we Gerda Why would off human as four 11 16 Works or Siegel wine? Why? Why stool horsepower?

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College Physics

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Kinetic Energy - Overview

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