A screw gauge is provided with a “ratchet” arrangement, in the form of a knob at the right end of the spindle. The screw should be rotated by this knob only. The purpose of this device is(a) to reduce zero error(b) to prevent backlash error(c) to control the rate of rotation of the screw(d) to prevent damage to the pitch of the screw

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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