1) An object is tossed vertically into the air with an initial velocity of 8 m/s. Using the sign convention up as positive, how does the vertical component of the acceleration a_y of the object (after leaving the hand) vary during the flight of object?

a) On the way up a_y> 0, on the way down a_y>0

b) On the way up a_y> 0, on the way down a_y<0

c) On the way up a_y< 0, on the way down a_y>0

d) On the way up a_y< 0, on the way down a_y<0

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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