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Block on incline and block on pulley

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The following pulley system is released from rest. The acceleration in ft/sec2 of block B is what?

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For motion of block B, mBg - 2T = mBa ....(i)
For motion of block A along the incline, T - ...

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Four problems on dynamics.

Please see attachment for fig.

24. Pictures below (see attachment) show the loads hanging from the ceiling of an elevator that is moving at constant velocity. Find the tension in each of three strands of cord supporting each load.

26. Angle phi =15 degree. Assuming the block start from the rest at the top and that the leghth of the incline is 2m. Find
a) Acceleration of the block
b) its speed when it reaches the bottom of the incline

28. 5.00 kg object placed on frictionless, horizontal table is connected to a cable that passes over a pulley and then is fastened to a hanging 9.00kg object as shown below (see attachment). Draw free body diagram of both. Find the acceleration of both objects and tension in the string?

54. 2 blocks of mass 3.5Kg and 8.0Kg are connected by a massless string that passes over a frictionless pulley. The inclinces are fictionless. Find
a) The magnitude of acceleration of each block
b) The tension in the string

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