## Calculate the acceleration of the valve under these conditions.

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A valve and tappet assembly fitted to an overhead camshaft engine has a mass of 200g. At a given engine speed, the force to open the valve is 250N.

## A single-plate clutch of 0.15 m effective diameter is lined with material of coefficient of friction 0.35. If the total spring force is 2.5 kN,

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Calculate: (a) The torque transmitted (b) The power transmitted at 3000 rev/min

## The main journal bearings of an engine crankshaft carry a total load of 10 kN when the engine speed is 3500 rev/min. If the coefficient of friction between each bearing and shaft is 0.015 and the diameter of the shaft is 60 mm,

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calculate: (a) The frictional torque on the shaft (b) The power absorbed by friction (c) The heat energy generated in the bearings per minute

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## In a drop-forging operation, the top die and its holder, which have a combined mass of 50 kg, fall freely on to the bottom die.

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Calculate: (a) The kinetic energy of the top die just before striking the bottom die if its velocity at that instant is 7.8 m/s (b) The height through which the top die has fallen

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