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Subject:
physics problem
Category: Science > Physics Asked by: tamisun-ga List Price: $6.00 |
Posted:
03 Jan 2006 23:21 PST
Expires: 03 Jan 2006 23:39 PST Question ID: 428830 |
I got a physic problem which I found it is impossible for me to solve. looking for some help here. the question goes: a man does 2200 J of work pulling a mass of 50 kg 60 meters at a constant speed. The coefficient of friction for the surfaces in contact is 0.26 the questions asks for a) the magnitude of the force applied by the man b)the angle at which the man is applying this force. I think it is impossible to solve, since to pull a 50kg mass 60 meters on the surface, one would need to apply a horizontal force of 50*9.8*0.26=127N to keep the velocity constant. To pull the mass 60m it would have done 127*60= 7644 J of Work. 2200 J of work is just impossible to pull a 50 kg to 60 m is the question wrong or did I miss something? thank you! |
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