# Elevator and scale

1. Oct 5, 2005

A person stands on a bathroom scale in a motionless elevator. When the elevator begins to move, the scale briefly reads only 0.67 of the person's regular weight. Calculate the acceleration of the elevator.

how do i start this problem? help please!!

2. Oct 5, 2005

### hotvette

do you have any equations of motion you are suppose to use?

3. Oct 5, 2005

### Paulanddiw

<tex>w=mg<txt>
when he's not accelerating his weight is something and g=32.2 ft/sec2. When the elevator accelerates his weight drops to .67 of what it was. (his mass hasn't changed)

4. Oct 5, 2005

### Paulanddiw

<tex> w=mg<tex> I really wish I could make LATEX work.

5. Oct 5, 2005

### hotvette

Use [ and ] instead of < and >

6. Oct 6, 2005

### andrevdh

The person is experiencing two forces, his weight and the force from the scale (the reading on the scale is caused by the action/reaction force of this). The vector sum of this two forces gives the resultant "elevator acccelerating force" on the person according to N2.

7. Oct 6, 2005

### HallsofIvy

And don't forget the / before the ending "tex":

[ tex ] e^{-x^2} [ /tex ]

gives $$e^{-x^2}$$.

The "Math Message Board" uses < > instead of [ ] and I am forever getting them mixed up!