Two students, Jahna and Raul, are performing Experiment 1 (the setup is pictured

Question

Two students, Jahna and Raul, are performing Experiment 1 (the setup is pictured below). To simplify their calculations, each will apply their force perpendicular to the arm of the apparatus. Jahna attaches her spring scale 15 cm from the pivot and pulls with a force of 2.5 N. Raul attaches his spring scale 10 cm from the pivot and pulls so that the apparatus is in equilbrium. What is the reading on Raul’s spring scale? Show your calculations.

Two students, Jahna and Raul, are performing Experiment 1 (the setup is pictured below). To simplify their calculations, each will apply their force perpendicular to the arm of the apparatus. Jahna attaches her spring scale 15 cm from the pivot and pulls with a force of 2.5 N. Raul attaches his spring scale 10 cm from the pivot and pulls so that the apparatus is in equilbrium. What is the reading on Raul?s spring scale? Show your calculations.

Explanation / Answer

The system is in equilibrium, so the net torque is zero. torques due to each of them are equal and oppsite.           = r x F           r1 x F1 = r2 x F2         (0.15)(2.5) = (0.1) F2 Rahul Scale reading on         F2 = (0.15)(2.5)/(0.1)               = 3.75N

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