Aspace probe is directly between two moons of a planet. if it is twice as far from moon a as it is from moon b, but the net force on the probe is zero, what can be said about the relative masses of the moons? a. moon a is twice as massive as moon b. b. moon a has the same mass as moon b. c. moon a is four times as massive as moon b. d. moon a is half as massive as moon b.

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)