The molecules in a six-particle gas have velocities
v⃗ 1=(20i^−30j^)m/s
v⃗ 2=(10i^+90j^)m/s
v⃗ 3=(−50i^+20j^)m/s
v⃗ 4=30i^m/s
v⃗ 5=(40i^−40j^)m/s
v⃗ 1=(−50i^−40j^)m/s
calculate vavg.
calculate vrms.

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)

What accounts for an increase in the temperature of a gas that is kept at constant volume? a. energy has been removed as heat from the gas. b. energy has been added as heat to the gas. c. energy has been removed as work done by the gas. d. energy has been added as work done by the gas.

To fully describe the photoelectric effect, scientists must consider which of the following to be quantized? o a. both light and matter o b. matter only o c. light only o d. neither light nor matter