Acharge of 6.7 × 10-15 coulombs is located at a point where its potential energy is 5.6 × 10-12 joules. what is the electric potential at that point? a. 2.3 × 102 volts b. 4.7 × 102 volts c. 8.4 × 102 volts d. 9.2 × 102 volts

Air enters a gas turbine with two stages of compression and two stages of expansion at 100 kpa and 17°c. this system uses a regenerator as well as reheating and intercooling – the intercooler returns the air to the inlet temperature. the pressure ratio across each compressor is 4 ; 300 kj/kg of heat are added to the air in each combustion chamber; and the regenerator operates perfectly while increasing the temperature of the cold air by 20°c. determine the system’s thermal efficiency. assume isentropic operations for all compressor and the turbine stages and use constant specific heats at room temperature. (0.378)