A man pulls a lawn roller with a force of 20 kgwt. He applies the force at an angle 60o 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
1kgwt=9.8N
So, force F=20kgwt=20×9.8N=196N
The horizontal component of the force F is Fh=Fcos60=196cos60=98N
The required work done W=Fhd=98×10=980J
The power developed in t=1 minute =W/t=980J/60s=16.33 Watt