For a reversible chemical reaction where the forward process is exothermic, which of the following statements is correct ? (A) The backward reaction has higher activation energy than the forward reaction (B) The backward and the forward processes have the same activation energy (C) The backward reaction has lower activation energy (D) No activation anergy is required at all since energy is liberated in the process.

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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