A 7.50 kg stone is rubbed across the ceiling of a cave by a force F angled upward. If the coefficient of kinetic friction is .72 and the angle of the force with the horizontal ceiling is theta equals 65 degrees, what is the magnitude of the force F if the stone is pushed with constant velocity

Gordon is going for a run through the park, but it is cold outside. the low outside temperature could affect his personal safety.

Patricia is trying to compare the average rainfall of new york to that of arizona. a comparison between these two states for the months of july through september would best be measured in

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)