Please see the following question and the answer. I don't understand how Fe/Fw = 0.12/0.43(adsbygoogle = window.adsbygoogle || []).push({});

Question?

Two small metal-coated styrofoam spheres each of mass 2.80e-6 kg are

attached to nylon threads 45.0 cm long and hung from a common point. The

spheres are then charged equally negative and the angle each supporting thread

makes with the vertical is 16°. Calculate the charge on each sphere.

Answer:

let Fe = electrical force

Fw = Weight force = 2.8e-6 X 9.8 = 2.744e-5 N

if θ = 16°, then hypotenuse = 0.45m, Opposite = 0.12 m, and adjacent = 0.43m

If the system is blanced:

Fe/Fw = 0.12/0.43

Can someone please explain the above equation?

Thank You.

Yudi

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# Homework Help: Clarification on calculating Electrical Force and charge

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