Homework Help: Physics - important

Posted by Linn on Tuesday, April 21, 2009 at 7:46pm.

An electron is accelerated through a uniform electric field of magnitude 2.5x10^2 N/C with an initial speed of 1.2x10^6 m/s parallel to the electric field.

a) Calculate the work done on the electron by the field when the electron has travelled 2.5 cm in the field.
b) Calculate the speed of the electron after it has travelled 2.5 cm in the field.
c) If the direction of the electric field is reversed, how far will the electron move into the field before coming to rest?

Physics - important - drwls, Tuesday, April 21, 2009 at 8:55pm
a) e E x
b) Assume the work done (above) equals the increase in kinetic energy
c) It will travel until
E e x = intial kinetic energy
Physics - important - Linn, Tuesday, April 21, 2009 at 9:20pm
Should the answer for B be 1.5x10^6 m/s because my book says it's wrong...
Physics - important - Linn, Tuesday, April 21, 2009 at 9:24pm
Oh, and what do you mean by 'x'?
Physics - important - really confused - Linn, Tuesday, April 21, 2009 at 9:26pm
Also, is there a final kinetic energy? I'm just really confused by this...
Physics - important - Linn, Tuesday, April 21, 2009 at 9:30pm
Won't the kinetic energies for question b and c be the same?

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