- Posted by smith on March 19th, 2010 filed in portal.jsqf.com
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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