considerable amount of heat is generated by the interaction between the
rotating auger and the churning polymer feedstock during extrusion. Suppose a
4-kW motor is used and 70% of the power goes into heating polyethylene fed at a
rate of 100 kg/h. If the heat capacity of polyethylene is 1.4 J/g-°C, what will
the temperature rise be in a half-hour? Assume no heat loss.