Suppose a power plant produces 1 GW of electricity at 40% efficiency, taking in steam at a temperature of 500◦ C. The waste heat is expelled into the environment at 20◦ C. At what rate (in watts) is heat expelled into the environment?

Two point charges are separated by a certain distance. how does the strength of the electric field produced by the first charge, at the position of the second charge, change if the second charge is doubled? a. the field does not change b. the field strength decreases by half. c. the field strength doubles d. the field strength quadruples