5. A uniform metal rod of length 80 cm and mass 3.2 kg is supported
horizontally by the two vertical
springs balances C and D. Balance C
is 20 cm from one end while balance
D is 30 cm from the other end. Find
the reading on each balance.

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)