Physics problem

[Shades McCool]

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I am trying to do this physics problem before the teacher has taught us how to do it. Can anyone help me out?

The electric field in a cathode ray tube is supposed to accelerate electrons from 0 to 1.6e7 m/s in a distance of 2.00 cm. What electric field is required? (mass of e = 9.11e-31 and electron = 1.6e-19 C)


Please help me out.

 

[ManchotPi]

Originally posted by Shades McCool
I am trying to do this physics problem before the teacher has taught us how to do it. Can anyone help me out?

The electric field in a cathode ray tube is supposed to accelerate electrons from 0 to 1.6e7 m/s in a distance of 2.00 cm. What electric field is required? (mass of e = 9.11e-31 and electron = 1.6e-19 C)


Please help me out.

 

[jcdoc107]

using kinematics find the acceleration of the electron. Then find the force required using F=ma. Next E=F/q.

 

[Northerner]

I think the answer is, "magic". If that's wrong, try: "by the will of the Almighty." If that's wrong, then try, "stop imposing your belief system on me, you'll hear from my lawyers!". If none of those are correct, ask a TA, because I'm all thunked out for one night.

 

[crazee8]

Originally posted by Shades McCool
I am trying to do this physics problem before the teacher has taught us how to do it. Can anyone help me out?

The electric field in a cathode ray tube is supposed to accelerate electrons from 0 to 1.6e7 m/s in a distance of 2.00 cm. What electric field is required? (mass of e = 9.11e-31 and electron = 1.6e-19 C)

Please help me out.

-First find the electron's acceleration. Use v^2 = Vo^2 + 2ax.
(v, Vo, and x have been given to you.)

- Use F=ma to find the force.

- Then use, E = F/q, to find the electric field.

Now just "plug and chug!" Hope that helps! 👍

 

[Shades McCool]

Thanks guys, you are great.

 

[DD214_DOC]

Originally posted by Northerner
I think the answer is, "magic". If that's wrong, try: "by the will of the Almighty." If that's wrong, then try, "stop imposing your belief system on me, you'll hear from my lawyers!". If none of those are correct, ask a TA, because I'm all thunked out for one night.

I actually put that as answer on an Organic I exam. I couldn't remember the solvents used in the general equation, so I wrote:

MoleculeA + Reactant --Magic--> ProductA + ProductB

 

[vegangirl]

MoleculeA + Reactant --Magic--> ProductA + ProductB

LOL. did you get partial credit for that??

 

[Northerner]

How is that wrong?