Created by StemPy LabA thin uniform spherical shell has mass and radius . Which graph correctly shows the gravitational potential against the distance from the centre of the shell?
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← A uniform solid sphere of radius R is spun about a horizontal axis through its centre with angular speed ω₀. It is then gently placed on a rough horizontal floor, with its centre at rest. At first it slips, and friction acts on it. After some time it starts to roll without slipping. The speed of its centre at that moment isA steel rail with a cross-sectional area of 40 cm² is held between two rigid supports, so that it cannot get longer. Its temperature rises by 30 K. For steel, Young's modulus is 2.0 × 10¹¹ N/m² and the coefficient of linear expansion is 1.2 × 10⁻⁵ K⁻¹. The force that the rail exerts on each support is →
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