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 lb/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 = Btu

A 40 lb object is subjected to an applied upward force of 20 lbf. The only other force acting on the object is the force of gravity. The acceleration of gravity is 32.2 ft/s². Determine the weight of the object, in lbf, and the net acceleration of the object, in ft/s². Step 1 Determine the weight of the object, in lbf, with positive values being down. W = 40 lbf Hint Step 2 Your answer is correct. * Your answer is incorrect. Determine the net acceleration of the object, in ft/s², with positive values being upward. 16.1 ft/s² a = Attempts: 1 of 3 used

A system in which there is no transfer of matter across the boundary. It consists a fixed amount of mass, and no mass can cross its boundary. That is, no mass can enter or leave a closed system

Determine the specific potential energy, in kJ/kg, of an object 50 m above a datum in a location where g = 9.8 m/s2 .

A construction crane weighing 12,000 lbf fell from a height of 500 ft to the street below during a severe storm. For g = 32.05 ft/s², determine the mass, in lb, and the change in gravitational potential energy of the crane, in ft-lbf.

A gas in a piston-cylinder assembly undergoes a process during which its volume reduces from 2 m to 1 m°. During this process, the system specific volume does not change O increases twice O reduces twice

A construction crane weighing 8,000 lbf fell from a height of 400 ft to the street below during a severe storm. For g = 32.05 ft/s², determine the mass, in lb, and the change in gravitational potential energy of the crane, in ft·lbf. Part A Determine the mass, in lb. m = i lb