A 3.00 kg crate is pulled along a frictionless surface with a force of 55.0 N at 25.00 to the horizontal so that it accelerates directly to the right. What is the crate's acceleration? *
2. Using the same scenario from problem 1, what is the normal force on the box from the surface.

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)