Posted by precious on Sunday, January 6, 2013 at 1:43am.
v₀ =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'
substitute 'a' in
s=v₀t - at²/2
and solve for 't'
Please 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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