A cart is moving on a track and slows down because of friction. Select all of the following statements that explain why the cart slows down. [You can select more than one answer] kinetic energy from the cart is converted to thermal energy in the cart

chemical potential energy in the cart is converted to kinetic energy in the track

kinetic energy from the cart is converted to thermal energy in the track

kinetic energy from the cart is converted to chemical potential energy in the cart

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)