# physics

posted by .

ok i have a problem to work on in my new course, and i was wondering what i need to do to tackle it. the question is as follows:

An electron is projected with an initial velocity Vo=10^7m/s into the uniform field between the parallel plates "E". the direction of the field is vertically downward and the field is zero everywhere else except between plates. the electron enters the field at a point midway the plates. if the electron just misses the upper plate as it uses energy from the field, find the magnitude of the field "E"

are these the formulas needed
F = ma = qE
s = ut + 0.5 at^2
v = u + at
v^2 = u^2 + 2as

and what does ( a, u, and s) stand for?

• physics -

Eq= force= mass*acceleration

solve for the acceleration upward.

NOTE: the u above is initial velocity, in the direction of deflection, u is zero.
a is acceleration
s is distance. now back to the problem
*************************

I would like to know the measurements of the plates, ie separation, and the length of the plates along the originalpath. Is that given?

• physics -

the distance between the two plates is 1cm

and the lengeth of each plate is 2cm

• physics -

the distance between the two plates is 1cm

and the lengeth of each plate is 2cm

so how do i get started

• physics -

Eq=mass*acceleration
so this is the acceleration toward the plate.

How long is it being accelerated?
lengthplate=V*t solve for time
So then we know that in the vertical acceleration between the plates.
distance moved=1/2 *.001m
but distance moved= 1/2 a t^2
set those equal, solve for a (you know time).

Now Eq=ma you know q, m, a solve for E

## Similar Questions

1. ### science

An electron had a constant acceleration of +3.2m/s^2. At a certain instant its velocity is +9.6m/s. What is its velocity at a)2.5 s earlier and b )2.5s later?
2. ### Physics

An electron is a subatomic particle (m = 9.11 *10^-31 kg) that is subject to electric forces. An electron moving in the +x direction accelerates from an initial velocity of +5.31 * 10^5 m/s to a final velocity of +2.21 * 10^6 m/s while …
3. ### Physics

A uniform electric field of magnitude 410 N/C pointing in the positive x-direction acts on an electron, which is initially at rest. The electron has moved 3.00 cm. (a) What is the work done by the field on the electron?
4. ### physics

a ball is projected at an angle with an initial velocity of 8m/s and an initial vertical velocity of 29.4m/s. Show trajectory diagram. Determine: a) displacement b)height at peak c)final speed
5. ### Math

A car is projected directly up an incline and its location from its start point is given by the formula s = 9t - 5t2. Determine its initial velocity and initial acceleration. initial velocity in m/s = initial acceleration in m/s2 = …
6. ### physics

An electron is projected, with an initial speed of vi=1.38e+05 m/sec, directly towards a proton that is essentially at rest. If the electron is initially a great distance from the proton, at what distance from the proton is its speed …
7. ### Physics

An electron is projected, with an initial speed of vi=2.06e+05 m/sec, directly towards a proton that is essentially at rest. If the electron is initially a great distance from the proton, at what distance from the proton is its speed …
8. ### physics

An electron has an initial velocity of 2.00 ✕ 10 6 m/s in a uniform 6.00 ✕ 10 5 N/C strength electric field. The field accelerates the electron in the direction opposite to its initial velocity. (a) What is the direction …
9. ### Physics

Hi! i am going to apply for a medical study admission test and where just wondering if you guys could help me to come up with the formula for solving this problem. I am not looking for a answer, just the mathematical formula to solve …
10. ### physics

A ball is projected with initial velocity 50m\s at an angle of elevation of 37°from the top of a cliff 55m high. calculate the total time the ball is in the air and the maximum horizontal distance covered...please I have solved this …

More Similar Questions