weight = m g = 5.19 (9.81)
normal force = 5.19(9.81) - 3.23 sin 20
pull force = 3.23 cos 20
work done per second = power = 3.23 cos 20 (3.38) Watts. Without time can not get energy.
power wasted to heat = all of it above
3.23 cos 20 = mu (normal force above)
A rope is used to pull a 5.19 kg block at constant speed 3.38 m along a horizontal floor. The force on the block from the rope is 3.23 N and directed 20.0° above the horizontal. What are (a) the work done by the rope's force, (b) the increase in thermal energy of the block-floor system, and (c) the coefficient of kinetic friction between the block and floor?
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