Adc current of 60 ma can cause paralysis of the body's respiratory muscles and hence interfere with breathing, but only 15 ma (rms) of ac current will do the same thing. suppose a person is working with electrical power lines on a warm humid day and therefore has a low body resistance of 1100 ohms. what dc and ac (amplitude and rms) potentials would it take to cause respiratory paralysis?

A47.2 g block of copper whose temperature is 480 k is placed in an insulating box with a 91.8 g block of lead whose temperature is 200 k. (a) what is the equilibrium temperature of the two-block system? (b) what is the change in the internal energy of the two-block system between the initial state and the equilibrium state? (c) what is the change in the entropy of the two-block system? the heat capacities of copper and lead are 386 j/kg·k and 128 j/kg·k, respectively.