CAIE A-Level Physics A2 13.3.2 G Gm R 2 Questions

[Maximum number: 2]

Artemis is a spherical planet that may be assumed to be isolated in space. The variation with distance x from the centre of Artemis of the gravitational potential $\phi$ is shown in Fig. 1.1.

Fig. 1.1

Calculate the gravitational field strength g on the surface of Artemis.

$g=\frac{G M}{r^{2}} \quad$ or $g=-\frac{\phi}{r}$ $\begin{aligned} =\frac{6.67 \times 10^{-11} \times 2.55 \times 10^{24}}{4800000^{2}} \text { or }=\frac{3.55 \times 10^{7}}{4800000} =7.4 \mathrm{~N} \mathrm{~kg}^{-1} \end{aligned}$

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CAIE A-Level Physics A2 13.3.2 G Gm R 2 Topic Practice

Question 1