Created by StemPy LabA block of mass is at rest on a smooth horizontal floor. From , a horizontal force (in newtons, with in seconds) acts on it. At , the power delivered by the force, and the total work it has done since , are
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← A block rests on a horizontal table. A string tied to it runs up over a small fixed pulley above the table, and a person pulls the free end of the string down at a steady speed u, as shown in the figure. At the instant when the part of the string from the block to the pulley makes an angle of 60° with the horizontal, the speed of the block along the table isA block of mass 4 kg lies on a smooth horizontal table. A light string tied to it passes over a pulley at the edge of the table and holds a block of mass 2 kg, which hangs freely, as shown in the figure. The pulley is a uniform disc of mass 4 kg, and the string does not slip on it. Taking g = 10 m/s², the acceleration of the blocks, and the tensions in the horizontal and vertical parts of the string, are →
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