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Home / Doubts and Solutions/NEET/Physics

Assuming the length of chain to be L and coefficient of static friction. Compute the maximum length of the chain which can be held outside a table without sliding? If the coefficient of friction between an insect and bowl isu and the radius of the bowl is r find the maximum height to which the insect can crawl in the bowl? Ablock of mass 2kg is placed on the floor. The coefficient of static friction is 0.4 A force F of 2.5N is applied on the block as shown. Calculate the force of friction between the block and the floor?

Asked by tusharpandeyyy 20th August 2018, 8:18 PM
Answered by Expert
Answer:
Do not send too many question in one posting. Only one question per question is allowed.
Only first question is answered.
 
Let x be the length of chain that is hanging outside the table as shown in figure. Let λ be the mass per unit length of chain.
various forces acting on the chain are shown in figure. weight of hanging part of chain pulls the part of the chain resting on the table.
Friction force acting against the pull experienced by the resting part of the chain.
 
hence,  if x is the length of the chain just long enough to hang outside, then we have  xλg = μN = μ(L-x)λg ............(1)
 
from eqn.(1) we get begin mathsize 12px style x space equals space fraction numerator mu over denominator 1 plus mu end fraction L end style
Answered by Expert 21st August 2018, 3:44 PM
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