Q1. To evaluate the program, suppose she runs up a flight of 85 steps, each 0.150 m high, in 69.0 s. For simplicity, ignore the energy she uses in coming down (which is small). Suppose that a typical efficiency for human muscles is 20.0 percent. This means that when your body converts 100 J from metabolizing fat, 20 J goes into doing mechanical work (here, climbing stairs). The remainder goes into internal energy. Suppose the student's mass is 53.0 kg.
Q2. Find out the mutual inductance per unit length between two long solenoids, one inside the other, whose radii are r_1 and r_2 and whose turns per unit length are n_1 and n_2.