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Sahay Sir > Question Answers > Uncategorised (JEE Advanced Physics by BM Sharma + GMP Solutions) > PQR is a wedge fixed to the floor. Two blocks A & B of equal mass m=1kg is placed on either side of wedge connected through a string passing over the pulley P. Initially PB=PA. Another block C of mass m=1kg moving with a velocity 10m//s collides inelasically with A. All the surfaces are smooth and pulley & string are massless. (a) What should be the minimum length of the string AB so that block A does not hit the pulley ? (b) What is the loss in meechanical energy from the instant C hits A to the instant when B starts moving upward ? (g=10m//s^(2))

PQR is a wedge fixed to the floor. Two blocks A & B of equal mass m=1kg is placed on either side of wedge connected through a string passing over the pulley P. Initially PB=PA. Another block C of mass m=1kg moving with a velocity 10m//s collides inelasically with A. All the surfaces are smooth and pulley & string are massless. (a) What should be the minimum length of the string AB so that block A does not hit the pulley ? (b) What is the loss in meechanical energy from the instant C hits A to the instant when B starts moving upward ? (g=10m//s^(2))

A carpet of unit mass an unit length is laid on the floor. One end of the carpet is bent back and then pulled backwards with constants. Unit velocity just above the part of the carpet which is still at rest on the floor. Find the speed of the centre of mass of the moving part. What is the minimum force needed to pull the moving part ?