A ball is thrown into the air at some angle between 10 degrees and 90 degrees. At the very top of the ball’s path, its velocity is

(A) entirely vertical

(B) entirely horizontal

(C) both vertical and horizontal

(D) there is not enough information given

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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