If the earth suddenly stops revolving and all its rotational KE is used up in raising its temperature and is S is taken to be specific heat of earth’s material , the raise of temperature of earth will be ( R=radius of earth , W=its angular velocity )

1)R²W²/5JS 2)R²W²/5J 3)R²W/5JS 4)R²W/5S

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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