The Sun radiates energy at the prodigious rate of 3.90 1026 W. (a) At what rate,

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The Sun radiates energy at the prodigious rate of 3.90 × 1026 W.
(a) At what rate, in kilograms per second, does the Sun convert mass into energy?
(b) Assuming that the Sun has radiated at this same rate for its entire lifetime of 4.50 × 109 y, and that the current mass of the Sun is 2.00 × 1030 kg, what percentage of its original mass has been converted to energy?
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Physics

ISBN: 978-0321976444

5th edition

Authors: James S. Walker

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