The mass of a baseball is 0.833 lb. Determine its kinetic energy relative to home plate of a 95.58 mile per hour fastball, in BTU.

A velocity of 25 km/hkm/h is equivalent to:   6.94 m/sm/s 90.0 m/sm/s 90. m/sm/s 6.9 m/sm/s

A gas is contained in a vertical piston-cylinder assembly by a piston with a face area of 60 in2 and weight of 100 lbf. The atmosphere exerts a pressure of 14.7 lbf/in² on top of the piston. A paddle wheel transfers 3 Btu of energy to the gas during a process in which the elevation of the piston increases slowly by 2 ft. The piston and cylinder are poor thermal conductors, and friction between the piston and cylinder can be neglected. Determine the work done by the gas on the piston, in Btu, and the change in internal energy of the gas, in Btu. Step 1 Determine the expansion work done by the gas on the piston, in Btu. Wexp = i Btu

A system receives 42 kJ of heat while expanding with volume change of 0.123 m3 against an atmosphere of 12 N/cm2. A mass of 80 kg in the surroundings is also lifted through a distance of 6 metres. (i) Find the change in energy of the system. (ii) The system is returned to its initial volume by an adiabatic process which requires 100 kJ of work. Find the change in energy of system. (iii) Determine the total change in energy of the system.