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Physics, 22.06.2019 13:40
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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Physics, 22.06.2019 17:50
Two identical stars with mass m orbit around their center of mass. each orbit is circular and has radius r, so that the two stars are always on opposite sides of the circle. (a) find the gravitational force of one star on the other. (b) find the orbital speed of each star and the period of the orbit. (c) how much energy would be required to separate the two stars to infinity?
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Physics, 23.06.2019 00:00
Boiling water is an example of physical change. true or false
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Physics, 23.06.2019 09:00
Auniform electric field exists in the region between two oppositely charged plane parallel plates separated by a distance of 1.60 cm . a proton is released from rest at the surface of the positively charged plate and strikes the surface of the opposite plate in a time interval of 3.20Γ10-6 s. 1-find the magnitude of the electric field. use 1.60Γ10-19c for the magnitude of the charge on an electron and 1.67Γ10-27kg for the mass of a proton 2-find the speed of the proton when it strikes the negatively charged plate
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A 10-kg rock falls from a height of 8-m above the ground. What is the kinetic energy of the rock jus...
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