CBSE Class 11-science Answered
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Asked by suchananag2002 | 11 Sep, 2019, 12:13: PM
Expert Answer
Figure shows the tension forces T acting on string that passing throug pulleys and connecting block-A and Block-C.
Tension force acting on the string connected to block B will be 2T.
Since Block-A and block-C are connected by same string, displacements magnitude will be same.
Hence magnitude of acceleration of block-A and block-C are same.
Due to length constraints, displacement of block B will be twice of displacement of string that connects block-A and block-C.
Hence block-B will move with acceleration 2a .
For convenience acceleration due to gravity is considered as 10 m/s2
Applying Newton's law for Block-A, we get, 20 - T = 2a .................(1)
Applying Newton's law for block-B, we get, 2T - 10 = 2a ................(2)
By solving eqn.(1) and (2), we get tension T = 10 N and acceleration a = 5 m/s2
Answered by Thiyagarajan K | 11 Sep, 2019, 03:58: PM
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