Consider a 500-kg solar-powered aircraft carrying 28 m2 of solar cells with 15% efficiency. The solar constant (power available from the sun per unit area) is 1.0 kW/ m2. Assume that 30% of engine power is spent on verti- cal climb; the rest goes into horizontal propulsion. De- termine the maximum vertical speed of this aircraft.

Currents in dc transmission lines can be 100 a or higher. some people are concerned that the electromagnetic fields from such lines near their homes could pose health dangers. for a line that has current 150 a and a height of 8.0 m above the ground, what magnetic field does the line produce at ground level? express your answer in teslas and as a percentage of the earth’s magnetic field, which is 0.50 g. is this value cause for worry?