a. State what is meant by the torque of a couple.
b. Three strings, A, B and C, are attached to a circular ring, as shown in Figure 4.35.
The strings and the ring all lie on a smooth horizontal surface and are at rest. The tension in string A is 8.0 N. Calculate the tension in strings B and C.

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string A string C 50° 90° string B Figure 4.37