A light inextensible rope is used to pull a particle of mass 3 kg along a rough horizontal plane. The tension in the rope is 15 N and acts at an angle of 40° above the horizontal.
If the coefficient of sliding friction between the particle and the surface is 0.45, what is the acceleration of the particle?

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What kind of simple machine is a catapult?

Consider a file currently consisting of 200 blocks. assume that the file control block (and the index block in the case of indexed allocation) is already in memory. calculate how many disk i/o operations are required for contiguous, linked, and indexed (single-level) allocation strategies, for each of the conditions listed below. in the contiguous-allocation case, assume that there is not room to grow at the beginning but there is room to grow at the end. also assume that the block information to be added is stored in memory.