Steam in a piston-cylinder assembly undergoes a polytropic process, with n = 2, from an initial state where p1 = 500 psi, v1 = 1.701 ft3/lbm, u1 = 1363.3 btu/lbm to a final state where u2 = 990.58 btu/lbm. during the process, there is a heat transfer from the steam of magnitude 342.9 btu. the mass of steam is 1.2 lbm. neglecting changes in kinetic and potential energy:
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Physics, 21.06.2019 23:20
In the sport of parasailing, a person is attached to a rope being pulled by a boat while hanging from a parachute-like sail. a rider is towed at a constant speed by a rope that is at an angle of 15 ∘ from horizontal. the tension in the rope is 1900 n. the force of the sail on the rider is 30∘ from horizontal. what is the weight of the rider? express your answer with the appropriate units.
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Physics, 22.06.2019 06:30
What is the energy of a photon of ultraviolet radiation with a frequency of 4.4 × 1015 hz? planck’s constant is 6.63 × 10–34
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Physics, 22.06.2019 12:20
Which of the following situations is impossible? a) an object has velocity directed east and acceleration directed east. b) an object has zero velocity but non-zero acceleration. c) an object has constant non-zero velocity and changing acceleration. d) an object has velocity directed east and acceleration directed west. e) an object has constant non-zero acceleration and changing velocity.
Answers: 2
Steam in a piston-cylinder assembly undergoes a polytropic process, with n = 2, from an initial stat...
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