A block of wrought iron is being dragged with a rope at constant velocity across a factory floor. The tension in the rope is 800 N and the block is moved by a distance of 50 m. (a) How much work is done by the pulling force? (b) How much work is done by the frictional force (just the magnitude)? (c) Assume that all the work done by friction is converted into heat, and that all the heat is absorbed by the block. Find the increase in temperature of the block.
A block of wrought iron is being dragged with a rope at constant velocity
across a factory floor. The tension in the rope is 800 N and the block is moved by a
distance of 50 m. (a) How much work is done by the pulling force? (b) How much work
is done by the frictional force (just the magnitude)? (c) Assume that all the work done by
friction is converted into heat, and that all the heat is absorbed by the block. Find the
increase in temperature of the block. (d) From what height would we have to drop the
block to produce the same increase in temperature as in part (c)? Assume that upon
impact with the ground all the kinetic energy of the block is converted into heat, and that
all the heat is absorbed by the block. The specific heat of iron is 450 J/kg 0 C.
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