Combustion is an example of ______ to_______ energy conversion.
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The approximate total distance Earth has traveled since its birth is 3.8×10²¹m.
The Earth moves in a circular orbit of radius <em>r</em> around the Sun and it takes 1 year to go once around the Sun. Thus in a year it travels a distance equal to <em>2πr, </em>which is the circumference of the Earth's orbit.
Therefore in <em>n</em> years that have elapsed, it would travel a distance <em>d</em> given by,
Substitute 3.14 for <em>π, </em>1.5×10¹¹m for <em>r</em> and 4×10⁹ for n.
Thus, the approximate total distance Earth has traveled since its birth is 3.8×10²¹m.