A2L Item 097

• Description: Identify the correct relation between the tensions in two strings supporting a uniform bar.
• Goal: Hone the concept of torque.
• Source: UMPERG-ctqpe150
• Keywords: Mechanics, Tension, Torque

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The question for students:

A uniform rod of length L, mass M, is suspended by two thin strings. Which of the following statements is true regarding the tensions in the strings?

1. T₂ = T₁
2. T₂ = 2.5T₁
3. T₂ = 0.6T₁
4. T₂ = 0.8T₁
5. None of the above

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Commentary for teachers:

Answer

(3) The ratio is most easily found by considering torques about the center of the bar. The distances of the strings to the center of the bar need to be determined visually from the figure.

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