- #1

Angie K.

- 108

- 1

## Homework Statement

*L*= 15.5 cm, mass

*m*= 1.44 g, and is placed in a field of 1.96 T, what constant current flow is needed in order for it to accelerate to 30 m/s in a distance of 1.0 m?

•Start by finding the magnetic force on the bar, which determines its acceleration via Newton's second law

*F*=

*ma*.

•The kinematic relation

*v*2 = 2

*ax*may be helpful (where

*v*is the velocity attained by an object having acceleration

*a*over a distance

*x*.)

## Homework Equations

F = I*B*L (current, magnetic field, length)

F = m*a

v^2 = 2ax where v is the velocity of object with an acceleration of a/x and x being the distnace

## The Attempt at a Solution

F = I*B*L

43.2 = I*(1.96T)(15.5*10^-2cm)

I tried solving for I that way, which didn't work

I tried the velocity using the v^2 = 2ax equation that was given and I got 7.746

But I'm not quite sure what to do with this.