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College Physics

1st Edition
Paul Peter Urone + 1 other
ISBN: 9781938168000

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BuyFindarrow_forward

College Physics

1st Edition
Paul Peter Urone + 1 other
ISBN: 9781938168000
Textbook Problem

The Sun produces energy at a rate of 4.00 × 10 26 W by the fusion of hydrogen. (a) How many kilograms of hydrogen undergo fusion each second? (b) If the Sun is 90.0% hydrogen and half of this can undergo fusion before the Sun changes character, how long could it produce energy at its current rate? (c) How many kilograms of mass is the Sun losing per second? (d) What fraction of its mass will it have lost in the time found in part (b)?

To determine

(a)

The amount of hydrogen undergoes fusion each second.

Explanation

Given:

Energy emitted by Sun, E=4×1026J/s

Calculation:

Since, 1kgof hydrogen undergoes fusion to helium to produce an energy of 6.4×1014J. In order to calculate the hydrogen undergoes fusion each second, divide the energy produce by Sun by the energy produce by 1kghydrogen.

Calculate the amount of hydrogen undergoes fusion each second using unitary method

To determine

(b)

The time to produce energy before Sun changes character.

To determine

(c)

The amount of mass of Sun loosing per second.

To determine

(d)

The fraction of mass loosing per second.

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