Velocity of sound in air is 320 m/s. a pipe closed at one end has length of 1 m. neglecting end corrections, the air column in the pipe can resonates for sound of frequency (a) 80 Hz (b) 320 Hz (c) 400 Hz (d) All (a), (b) & (c)

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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