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April 16, 2014

April 16, 2014

Posted by **precious** on Sunday, January 6, 2013 at 1:43am.

Pls show full working and formular.

- mechanics- physics -
**Elena**, Sunday, January 6, 2013 at 4:34amv₀ =5•10⁶ m/s

v=2.1•10⁶ m/s

s=2•10⁻⁴ = 2•10⁻⁶ m

------------

v= v₀-at

a= (v₀-v)/t

substitute 'a' in

s=v₀t+at²/2

and solve for 't'

- mechanics- physics -
**Elena**, Sunday, January 6, 2013 at 4:34amsubstitute 'a' in

s=v₀t - at²/2

and solve for 't'

- mechanics- physics -
**drwls**, Sunday, January 6, 2013 at 4:46amPlease save yourself the extra time of writing scientific notation numbers such as

5*10^6

Instead of

5 x 10 raise to power 6.

It is also easier to read.

In the case of this problem, divide the thickness of the paper by the AVERAGE speed of the electron as it passes through. That average speed is

3.5*10^6 m/s.

I think you have omitted an important minus sign. I have never seen a sheet of paper 210 meters thick.

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