Physics, 28.10.2019 05:31 josephicarusmarrujo

What happens to metal railroad tracks during the heat of a summer day

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Physics, 22.06.2019 02:00, Kyliehayden05

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Physics, 22.06.2019 06:50, tessalopezgarcia2345

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Physics, 22.06.2019 12:50, starr3971

Air is contained in a variable-load piston-cylinder device equipped with a paddle wheel. initially, air is at 400 kpa and 17°c. the paddle wheel is now turned by an external electric motor until 75 kj/kg of work has been transferred to air. during this process, heat is transferred to maintain a constant air temperature while allowing the gas volume to triple. calculate the required amount of heat transfer in kj/kg.

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Physics, 22.06.2019 13:40, mvongphakdy8746

Consider a double atwood machine constructed as follows: a mass 4m is suspended from a string that passes over a massless pulley on frictionless bearings. the other end of this string supports a second similar pulley, over which passes a second string supporting a mass of 3m at one end and m at the other. using two suitable generalized coordinates, set up the lagrangian and use the lagrange equations to find the acceleration of the mass 4m when the system is released. explain why the top pulley rotates even though it carries equal weights on each side.

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What happens to metal railroad tracks during the heat of a summer day...