Sally walks at a steady pace of 2.5 m/s for 5 seconds. Her friend, Heather, walks at a steady pace of 3 m/s for 5 seconds and Heather’s brother Myles runs at a pace of 6 m/s for 5 seconds. Make a graph and data table

State one advantage and one disadvantage of using a plane mirrior as a driving mirrior

If the force applied to an object remains constant, is more power needed for the object to move faster ? explain

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)