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15 May, 05:29

A 1.0-kg weight is suspended from the middle of a 1.3-m long rope that has one end fixed to a wall. What force would you have to exert on the other end of the rope to pull it perfectly horizontal?

a. 49 N

b. 0.98N

c. 980N

d. 0.49N

e. It cannot be done

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Answers (1)
  1. 15 May, 05:45
    0
    e. It cannot be done

    Explanation:

    Let T be tension in the rope. The component of T in vertical direction will balance the weight.

    Since T makes angle 90 degree with vertical (since rope is perfectly horizontal)

    2T cos 90 = mg

    T = mg / 2 cos 90

    = mg / 2 x 0

    = infinity

    Tension will have to be infinity which is not possible.
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