Calculate the initial velocity of the elevator

[anglum]

i have the ma+mg stuck in my head. and drawing it isn't helpin me in explaining to u where i am

 

[learningphysics]

It is always best to start your force problems by writing out the equations in the form:

$$\Sigma{F} = ma$$

and going from there... don't take shortcuts.

 

[anglum]

the force the earht exerts is

x = MA
x = 65*9.8
x=637N

 

[learningphysics]

i have the ma+mg stuck in my head. and drawing it isn't helpin me in explaining to u where i am

don't get stuck with the ma + mg... always start from the basics...

$$\Sigma{F} = ma$$.

But anyway, for this problem, what is the force the Earth exerts on the student?

 

[learningphysics]

the force the earht exerts is

x = MA
x = 6589.8
x=637N

yes. So what is the force the student exerts on the earth?

 

[anglum]

the student exerts

X=5.98*10^24 * A

 

[anglum]

does X in this also equal 637N

 

[learningphysics]

does X in this also equal 637N

exactly.

 

[anglum]

so then i solve it as 637/5.98*10^24 = A

A = 1.065217 *10^-22

 

[anglum]

awesome... thank you soooooo much for all your help tonite... u are a very patient man and a very good teacher

 

[learningphysics]

awesome... thank you soooooo much for all your help tonite... u are a very patient man and a very good teacher

you're welcome. glad to help. keep at it! you're doing well!