# Exam-Style Question on Ratio Standard Form

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Question id: 248. This question is similar to one that appeared on a GCSE Higher paper (specimen) for 2017. The use of a calculator is allowed.

The surface gravity, $$g$$, of a planet is the gravitational acceleration experienced at its surface. The following formula can be used to find how a planet's gravity compares to Earth's.

$$g=\frac{6.67 \times 10^{-11} \times m}{r^2}$$

Where $$m$$ is the mass of the planet and $$r$$ is the radius.

Find the ratio of the surface gravity on Jupiter and the surface gravity Mars. Give your answer in the form $$n:1$$.

 Mass (kg) Radius (m) Jupiter 1.90 × 1027 6.68 × 107 Mars 6.39 × 1023 3.39 × 106
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