Question

A 3 .2 kg uniform beam with length of 2.1 m is held perpendicular to the vertical pole by a 3.6 m string going from vertical pole to the far end of the beam (a) find the tension in the string. (b) If a shorter string is used, will its tension increase decrease or stay the same as part explain (a)? (c) Find the tension iflength of string is 2.5 m.

Answer 1

(a)

Take Moment about O

ANSWER:

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(b) ANSWER: Tension increases

When a shorter string is used ,the hypotenuse is reduced ,that means the angle string make with beam is reduced.

The Value of decreases when decreases ,so a larger Tension is required to keep the beam in equilibrium, since the

Sine Component of Tension is acting opposite to weight of beam

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(c)Is the string length is 2.5 m

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Take Moment about O

ANSWER:

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