Large amounts of depleted uranium (²³⁸U) are available as a by-product of uranium processing for reactor fuel and weapons. Uranium is very dense and makes good counter weights for aircraft. Suppose you have a 4000-kg block of ²³⁸U.

(a) Find its activity.

(b) How many calories per day are generated by thermalization of the decay energy? 

(c) Do you think you could detect this as heat? Explain.