A dise of mass 10 g is kept floating horizontally by throwing 10 marbles per secound against it from below . If mass of each marble is 5 g Calculate the velocity with which marbles are striking the disc . Assume that marbles strike the disc . Normally and rebound downwards with the same speed.

A dise of mass 10 g is kept floating horizontally by throwing 10 marbl

1.	A dise of mass 10 g is kept floating horizontally by throwing 10 marbles per secound against it from below . If mass of each marble is 5 g Calculate the velocity with which marbles are striking the disc . Assume that marbles strike the disc . Normally and rebound downwards with the same speed.
Answer» Here , ` M = 10 g =10 -^(2) kg , n= 10 , ` ` m= 5 g = 5 xx 10^(-3) kg , upsilon = ` ? To keep the disc floating horizontally Weight of dics = upward force on the disc = rate of change of momentum of marbles ` 10^(-2) xx 9.8 = n xx m xx 2 upsilon = 10 xx 5 xx 10^(-3) xx 2 upsilon ` ` = (upsilon)/(10)= ` ` upsilon = 9.8 xx 10^(-2) xx 10 m//s = 0.98 m//s ` .

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A dise of mass 10 g is kept floating horizontally by throwing 10 marbles per secound against it from below . If mass of each marble is 5 g Calculate the velocity with which marbles are striking the disc . Assume that marbles strike the disc . Normally and rebound downwards with the same speed.

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