Please answer the following two questions:
3) Two cylindrical copper wires with a radius of 39 cm areconnected to a battery and then they are connected across anincandescent light bulb and the light bulb turns on and is somebrightness. If you took the same battery and connected coppers twowires which were a factor of 6 times longer than the first twowires to the same lightbulb so that the lightbulb was the exactsame brightness as the first wires (it's not dimmer or brighter),what must be the radius of the second wires in cm?
4) Electricity is actually a very cheap form of energy. Supposethe cost of energy is 17.5 cents/kwh. If all the electrical energyused in purchasing $1 of electricity were converted to potentialenergy of raising 30,000 kg truck, how high above the ground wouldthe truck be raised in m?
