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akash kashyp Grade: Upto college level
        

a plank of mass 2kg and length 1m is placed on horizontal floor, a small block of mass 1kg is placed o top of the plank,at its extreme end. the co efficient of friction between plank and floor is 0.5 and that between plank and block is 0.2 .if a horizontal force=30N starts acting on the plank to right,the time after which,the block will fall off the plank?

7 years ago

Answers : (1)

Badiuddin askIITians.ismu Expert
147 Points
										

Dear akash


 


6406-273_7662_1.JPG


let at time t small block cover a distance x


and for amall block to fall plank must cover (x+1) m in time t


accelarion of small block=2/1 =2


acceleration of plank =(30-15-2)/2 =13/2


so x= 1/2 *a1 *t2   =   t2 .................1


and


x+1 =1/2 *a2*t2


put value of x from equation 1


 t2 +1 =1/2 *a2*t2


t=2/3 sec






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7 years ago
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