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Any hints or ideas? I know to use a force...
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File: PithBall.png (11 KB, 654x248) Image search: [iqdb] [SauceNao] [Google]
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Any hints or ideas? I know to use a force balance involving tension, force of gravity, and electric force but then from there i'm confused.
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>>16761528
I think that small car should be driving on the road. Try penciling it in.
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>>16761554
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You were probably under the impression that you would get useful information form these retards, you were wrong. Go to sci.
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>>16761528
It has been a while, but you need to figure out the vertical component of the force with relation to the angle.

So drop a trig function in somewhere.
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>>16761528
sin(theta)mg=-q
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>>16761738
also equilibrium means

sum of forces in ALL directions are 0
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the x component of gravity is equal and opposite to the charge force pushing the ball away from the plane

m*g*sin(theta) = qE where E = sigma/epsilon where sigma is the charge density and epsilon is a constant

solve for the charge density

Also don't take my word on the equations, check these up in your textbook
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>>16761744
yes but the y direction is not relevant to the question as it only involves the vertical components of tension and gravity; the resulting equation doesn't yield any information that leads to the answer to the question
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>>16761757
the x component of the tension*
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WAIT I WAS WRONG

Here it is:

Sum of Forces in Y:

Tcos(theta) = mg

Rearranging,

T = mg/cos(theta)

Sum of Forces in X:

Tsin(theta) = qE = q*sigma/epsilon

Subsituting,

mg/cos(theta)*sin(theta) = q*sigma/epsilon

mg*tan(theta) = q*sigma/epsilon

sigma = mg*tan(theta)*epsilon/q
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have no fucking clue but that was written on LaTeX so I'm happy about it.