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The assembly ABCD shown in Fig Q3 is made of three hollow shafts. The end A i...

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The assembly ABCD shown in Fig Q3 is made of three hollow

shafts. The end A is fixed and the couplings at B and C joins the three shafts

together. The diameters d

1, d2, and d3

of the three shafts are 81, 56

and 38 mm respectively. Each shaft has a wall thickness of 4 mm.

The lengths l

1, l2, and l3

are 116, 105 and 84 mm

respectively. A torque of 2.1 kNm is applied about the axis of the shaft

at the end D. Calculate the angle of twist of the assembly at the free end D of

the shaft in degrees. The shear modulus of the shafts is 80 GPa? Answer in degrees to 2 decimal places.

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