Atrain travels 77 kilometers in 1 hour, and the 66 kilometers in 1 hour. what is the average speed?

Blank liquids and gases exert a buoyant force on objects placed in them

2kg of refrigerant 134a undergoes a polytropic process in a piston-cylinder assembly from an initial state of saturated vapor at 2 bar to a final state of 12 bar, 80 degree c. a)determine the work for the process in kj. b)sketch the process on a p-v diagram.

One object has a mass of 1 kg and another object has a mass of 3 kg. if the speeds are the same, which of the following is true about their kinetic energy?