A star with the same mass and diameter as the sun rotates about a central axis with a period of about [06] days. Suppose that the sun runs out of nuclear fuel and collapses to form a white dwarf star with a diameter equal to that of the earth. Assume the star acts like a solid sphere and that there is no loss of mass in the process. and that the star has no external torques acting on it. Note however, that as the star cools and gravity causes it to contract, its rotational kinetic energy changes. What is the ratio of final to initial kinetic energies (Kf/Ki)?
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Physics, 22.06.2019 11:50
Two resistors r1 and r2 may be connected either in series or parallel across an ideal battery with emf ε. we desire the rate of energy dissipation of the parallel combination to be 8.75 times that of the series combination. if r1 = 105 ω, what are the (a) smaller and (b) larger of the two values of r2 that result in that dissipation rate?
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Physics, 22.06.2019 15:30
What are the similarities & differences between a thermistor and a light dependent resistor in physics?
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Physics, 22.06.2019 17:00
How many meters will a car travel if its speed is 45 m/s in an interval of 11 seconds? question 2 options: a) 450 meters b) 495 meters c) 4.09 meters d) 498 meters
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A star with the same mass and diameter as the sun rotates about a central axis with a period of abou...
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