Created by StemPy LabThe mass of the Earth is times the mass of the Moon, and the distance between their centres is . A spacecraft travels along the line joining them. At what distance from the centre of the Earth do the gravitational pulls of the Earth and the Moon on the spacecraft cancel?
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← A uniform cube of mass m and side a rests on a rough horizontal floor. A horizontal force F is applied at the middle of one top edge, at right angles to that edge, as shown in the figure. Assuming the floor is rough enough that the cube does not slide, the smallest F that starts to tip the cube over its far bottom edge, and the smallest coefficient of friction that allows tipping without sliding, areA flat plate of area 0.1 m² is pulled at a steady 0.5 m/s over a layer of oil 1 mm thick, which lies on a fixed flat surface. The coefficient of viscosity of the oil is 0.2 Pa s. The force needed to keep the plate moving is →
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