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A man pulls a...

Question

A man pulls a lawn roller with a force of 20 kgwt. He applies the force at an angle $60^{o}$ with ground. Calculate work down in pulling the roller through 10 m. If he takes 1 minute in doing, then, calculate the power developed.

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Solution

$1 k g w t = 9.8 N$
So, force $F = 20 k g w t = 20 \times 9.8 N = 196 N$
The horizontal component of the force F is $F_{h} = F c o s 60 = 196 c o s 60 = 98 N$
The required work done $W = F_{h} d = 98 \times 10 = 980 J$
The power developed in $t = 1$ minute $= W / t = 980 J / 60 s = 16.33$ Watt

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