A-level Physics · Gravitational fields

Gravitational field strength

Find g at a height above a planet's surface using g = GM/r² with r = R + h.

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Question 1

The Moon has a mass of 7.35×10227.35 \times 10^{22} kg and a radius of 1.74×1061.74 \times 10^{6} m. Calculate the gravitational field strength at a point 1140 km above the surface of the Moon. Use G = 6.67×10−116.67 \times 10^{-11} N m² kg⁻². Give your answer to 3 significant figures.

N kg⁻¹

You can type 4.53, 3.2e-5, 3.2 × 10^-5 or 7/3.

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