Created by StemPy LabA small moon goes round a planet in a circular orbit with a period of days. Suppose the moon were suddenly stopped in its orbit. Treating the planet and the moon as points, how long would the moon take to fall into the planet?
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← Three stars, each of mass 2.0 × 10³⁰ kg, sit at the corners of an equilateral triangle of side 1.0 × 10¹¹ m. They move together in one circle round the centre of the triangle, under their own gravity alone, so that the triangle keeps its shape, as shown in the figure. Take G = 6.67 × 10⁻¹¹ N m²/kg². What is the period of their motion?Treat the Earth as a uniform sphere of radius R = 6400 km, with g = 10 m/s² at its surface, and take the gravitational potential to be zero far away. Which of the following statements are correct? →
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