19.a 20 kg sign is pulled by a horizontal force such that the single rope (originally vertical) holding the sign makes an angle of 21° with the vertical. assuming the sign is motionless, finda) the magnitude of the tension in the rope andb) the magnitude of the horizontal force.

A)

B)

Explanation:

Using the free body diagram and according to Newton's first law, we have:

A) Solving (1) for T:

B) Solving (2) for F:

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