A pulley of radius 2m is rotated about its axis by a force F = (20t – 5t2) newton (wheret is measured in seconds) applied tangentially. If the moment of inertia of the pulley aboutits axis of rotation is 10kgm2, the number of rotations made by the pulley before its directionof motion if reversed is?

in a physics laboratory a block x is balanced by a block Y of mass 200 kg,each are suspended from a balance of equal lever arms .the scale pan on X is at a height.H1=2 cm ,where as scale pan on Y is at height 1 cm above the floor.the error in weighing is (in gram)

consider the figure of a single riveted lap joint as follows

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cyclic heat engine operates between. temperature of 30 C. What is the least rate of heat rejection per kW net output of an engine. source temperature of 800 C and sink

 

 

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