A perfectly insulated aluminium rod has length 50 cm and cross-sectional area 3.0 cm? At the steady steady state, the temperature at 0 cm and 50 cm ends are 150 ° C and 50° C. Thermal conductivity of aluminium is 210 Wm' K'. Calculate the rate of heat flow.

The great sandini is a 60.0-kg circus performer who is shot from a cannon (actually a spring gun). you don’t find many men of his caliber, so you him design a new gun. this new gun has a very large spring with a very small mass and a force constant of 1100 n/m that he will compress with a force of 4400 n. the inside of the gun barrel is coated with teflon, so the average friction force will be only 40.0 n during the 4.00 m he moves in the barrel. at what speed will he emerge from the end of the barrel, 2.50 m above his initial rest position?