Q. Ricardo, mass 81 kg and Carmelita, who is lighter, are enjoying Lake Merced at dusk in a 30 kg canoe. When the canoe is at rest in the placid water, they exchange seats, which are 3.0 m apart and symmetrically located with respect to the center of the canoe. Ricardo notices that the canoe moved 36.8 cm relative to a submerged log during the exchange and calculates Carmelita's mass, which she has not told him. What is it?
Q. A 31.0 cm diameter coil consists of 22 turns of circular copper wire 2.6 mm in diameter. A uniform magnetic field, perpendicular to the plane of the coil, changes at a rate of 8.60 multiplied by 10-3 T/s. Determine the current in the loop.Determine the rate at which thermal energy is produced.