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~christina~

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## Homework Statement

On a certain planet, the acceleration dute to gravity is the same as that on earth but there is a strong downward electrical field with the field being uniform close to the planet's surface. The magnitude of this electric field is E= 4.75x10^5N/C. A 1.00kg mass carrying a charge of [tex]100\mu C[/tex] is connected to a vertical spring for which the spring constant is 200N/m. The spring is not stretched when the mass is released from rest.

a) by what maximum ammount does the spring expand?

b) What is the equillibrium postition of the mass

c) show that the mass executes simple harmonic motion

## Homework Equations

## The Attempt at a Solution

[tex]E= 4.75x10^5 N/C[/tex]

[tex]m= 100kg[/tex]

[tex]q= 100\muC [/tex]

[tex]k= 200N/m[/tex]

[tex]g= 9.8m/s^2 [/tex]

hm..I would think that the downward gravitational field would make the force pushing a person or mass down would be greater.

sort of lost here.

Can someone help? Thanks

I was thinking that well there is force downward on the spring that is initially unstretched but this Fy is composed of electric field and gravity so:

E= F/q

I think I can find the force since the E is given and the q is given right?

Then would I just add that to the gravitational force?

and then use that on spring as in F=-kx since I would have the force ?

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