what is the acceleration of the block and trolley system as shown below, if the coefficient of kinetic friction between the trolley and the surface is 0.4? what is the tension in the string. take g= 10 m per second squared.
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Fathima Nissar asked in Physics
Example 5.9 What is the acceleration of the block and trolley system shown in a Fig. 5.12(a), if the coefficient of kinetic friction between the trolley and the surface is 0.04? What is the tension in the string? (Take g = 10 m s-2). Neglect the mass of the string.

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Ved Prakash Lakhera answered this
2960 unhelpful votes in Physics, Class X
Kinetic coefficient of friction μk=0.04 given. From the diagram the equations of motion of the system network is given by,30−T= M1a or 30−T=3×a −−−−−(1) andT−fk=M2a−−−−−−(2).In the above equations M1 and M2 are the masses of block and trolley.fk=μkR and R=M2×g=20×g=20×10=200N.Therefore fk=0