A closed system with a mass of 15 lbm is pulled up a rough inclined slope. 8 lbf is applied to raise the system and overcome friction while the system traverses 3 ft along the surface. During this process, the system loses 0.3 Btu by a combination of radiation and convection and an electric resistance heater inside the system draws 0.25 kW of electricity over 2 s. At the start of the process the system has a velocity of 7 ft/s and an elevation of 6 ft above the ground. At the end of the process the system has a velocity of 1 ft/s, an elevation of 8 ft and an internal energy of 4 Btu. Find the internal energy at state 1, in Btu.
A closed system with a mass of 15 lbm is pulled up a rough inclined slope. 8 lbf is applied to raise the system and overcome friction while the system traverses 3 ft along the surface. During this process, the system loses 0.3 Btu by a combination of radiation and convection and an electric resistance heater inside the system draws 0.25 kW of electricity over 2 s. At the start of the process the system has a velocity of 7 ft/s and an elevation of 6 ft above the ground. At the end of the process the system has a velocity of 1 ft/s, an elevation of 8 ft and an internal energy of 4 Btu. Find the internal energy at state 1, in Btu.
Principles of Physics: A Calculus-Based Text
5th Edition
ISBN:9781133104261
Author:Raymond A. Serway, John W. Jewett
Publisher:Raymond A. Serway, John W. Jewett
Chapter7: Conservation Of Energy
Section: Chapter Questions
Problem 12P: A crate of mass 10.0 kg is pulled up a rough incline with an initial speed of 1.50 m/s. The pulling...
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A closed system with a mass of 15 lbm is pulled up a rough inclined slope. 8 lbf is applied to raise the
system and overcome friction while the system traverses 3 ft along the surface. During this process, the
system loses 0.3 Btu by a combination of
inside the system draws 0.25 kW of electricity over 2 s. At the start of the process the system has a
velocity of 7 ft/s and an elevation of 6 ft above the ground. At the end of the process the system has a
velocity of 1 ft/s, an elevation of 8 ft and an internal energy of 4 Btu. Find the internal energy at state 1,
in Btu.
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