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akash kashyp Grade: Upto college level
        


a man of mass 60kg standing on a block of mass 40kg kept on ground.the co efficient of friction between the feet of man and the block is 0.3 and that between block and ground is 0.2.if the man pulls the one end string with 125N force and another end of string is connected to block through a pulley fixed to the wall in front,then       a)block will slide on ground   b)man and block move with accEleration 0.5 c)friction acting between man and block is 40N d)the friction acting between man and block is 180..


multi answer type question ............please with explain free body diagrams 


7 years ago

Answers : (1)

Badiuddin askIITians.ismu Expert
147 Points
										

Dear akash


for slipping take place between man and block so T must be greater than  0.3*N =0.3*60 *g=180


but T is less than 180N so slipping not take place


 


6369-84_7662_untitled.JPG


let the whole accembly will move eith acceleration a


so


2T-(60+40)*.2*g =(60+40)a


250-200=100a


a=.5


let the friction between man and block is f


T+f=60*.5


  f=30-125=-95 N(opposite direction as assumed)


so aption a and b are correct


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7 years ago
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