Two weights m₁-2 kg and m2=1 kg are linked by a thread and thrown over a pulley weighing M-1 kg. Find: (I) the acceleration with which the weights move, (2) the tensions T, and T2, of the threads which the weights are attached to. Consider the pulley as a homogeneous disk. Disregard friction.​

An insulated 40 ft^3 rigid tank contains air at 50 psia and 120°f. a valve connected to the tank is now opened, and air is allowed to escape until the pressure inside drops to 25 psia. the air temperature during this process is kept constant by an electric resistance heater placed in the tank. determine the electrical work done during this process.