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Q. A binary system consists of two stars that revolve in a circular orbit about a center of mass midway between them. This means that the masses of two stars are equal. Suppose the orbital speed of each star is 285 km/s and the orbital period of each is 16.50 days.

Find out the mass M of each star.

Q. What is the necessary resistance of an immersion heater that would increase the temperature of 1.50kg of water from 10°C to 50°C in 6 min even as operating at 120 V?

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Category:- Physics
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