Two blocks of mass 2. 9 kg and 1. 9 kg are suspended from a rigid support S by two inextensible wires each of length 1 m (see figure). The upper wire has negligible mass and the lower wire has a uniform mass of 0. 2 kg/m. The whole system of blocks, wires and support have an upward acceleration of 0. 2 m/s 2 . The acceleration due to gravity is 9. 8 m/s 2 . Find the tension at the midpoint of the upper wire.

Question

Two blocks of mass 2. 9 kg and 1. 9 kg are suspended from a rigid support S by two inextensible wires each of length 1 m (see figure). The upper wire has negligible mass and the lower wire has a uniform mass of 0. 2 kg/m. The whole system of blocks, wires and support have an upward acceleration of 0. 2 m/s 2 . The acceleration due to gravity is 9. 8 m/s 2 . Find the tension at the midpoint of the upper wire.,

MARKS App · Accepted Answer

To find tension at mid-point of the upper wire The equation of motion gives T 2 - 5g = 5a Therefore T 2 = 5(g + a) = 5(9. 8+0. 2) = 50 N

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