What are three forms of energy interactions though boundaries of a system?   A. Internal energy   B. Heat   C. Work   D. Mass flow

A closed system consisting of 10 lb of air undergoes a polytropic process from p₁ = 80 lbf/in². v₁ =4 ft3/lb to a final state where p2 = 20 lbf/in², v₂ = 11 ft³/lb. Determine the polytropic exponent, n, and the amount of energy transfer by work, in Btu, for the process. Determine the polytropic exponent, n, for the process. n=

In an open system there must always be which of the following? There may be greater than one answer? Select one or more: O a. A heat transfer across the system boundary O b. A work transfer across the system boundary O c. A flow of mass across the system boundary

Steam in a piston-cylinder assembly undergoes a polytropic process, with n = 2, from an initial state where V₁ = 4.38600 ft³, p1 = 350 lb-/in², and u₁ = 1322.4 Btu/lb to a final state where u₂ = 1036.0 Btu/lb and v₂ = 3.393 ft³/lb. The mass of the steam is 2.5 lb. Changes in kinetic and potential energy can be neglected. Determine the change in volume, in ft3, the energy transfer by work, in Btu, and the energy transfer by heat, in Btu. Step 1 Determine the change in volume, in ft³. ΔV=\i Save for Later ft3 Attempts: 0 of 4 used Step 2 The parts of this question must be completed in order. This part will be available when you complete the part above. Step 3 The parts of this question must be completed in order. This part will be available when you complete the part above. Submit Answer