torque exerted on the bar by the cord
A horizontal bar with a mass m suspended from one end is held by a cord with tension T, fastened at a distanceD from the end of the bar that is attached to a wall with a frictionless pin. What is the torque about the pin exerted on the bar by the cord?
POSSIBLE ANSWERS:
1. D Tcosθ
2. D T tanθ
3. DT(1-cosθ)
4. DT (1-tanθ)
5. DTsinθ
6.DT(1-sinθ)
Homework Answers
Vertical component of tension only will act a torque on the barabout the pin
Vertical component of tension = Tsinθ
distance from the point of force acting and the pin is D
therefore the torque = force x distance
= Tsinθ x D
= DTsinθ
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object as it passes through the bottom of the swing
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periodic. Is it also simple harmonic? why or why not?
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