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A 70 kg tightrope walker makes a wire sag by 5 degrees. The tension in the wire is about:
A390 N
B3900 N
C686 N
D70 N
Answer & Solution
Correct answer: B. 3900 N
1. Only the small vertical component supports the weight.
2. Tension is weight over twice sin 5 degrees.
3. That gives about 3900 N, nearly six times the weight.
_Source: OpenStax College Physics for AP Courses 2e, Chapter 4, Dynamics: Force and Newton's Laws of Motion (CC BY 4.0)._
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