Questions
A ping-pong ball of mass m is floating in air by a jet of water emerging out of a nozzle. If the water strikes the ping-pong ball with a speed v and just after collision water falls dead, the mass flow rate of water in the nozzle is equal to
detailed solution
Correct option is B
here weight of the ball is balanced by momentum transferred by water per sec mg=dpdt=ddtmv=dmdtv dmdt=mgvTalk to our academic expert!
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A rectangular block of size 10 cm x 8 cm x 5 cm is kept in three different positions P, Q and R in turn as shown in the figure. In each case, the shaded area is rigidly fixed and a definite force F is applied tangentially to the opposite face to deform the block. The displacement of the upper face will be
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