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

An electron moving at a speed of 5 x 10 raise to power 6m/s was shot through a sheet of paper which is 2.1 x 10 raise to power 4cm thick. The electron emerges from the paper with a speed of 2 x 10 raise to power 6 m/s. Find the time taken by the electron to pass through the sheet.

Pls show full working and formular.

- mechanics- physics -
**Elena**, Sunday, January 6, 2013 at 4:34am
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'

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

s=v₀t - at²/2

and solve for 't'

- mechanics- physics -
**drwls**, Sunday, January 6, 2013 at 4:46am
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.

## Answer this Question

## Related Questions

- mechanics- physics - An electron moving at a speed of 5 x 10 raise to power 6m/s...
- mechanics- physics - An electron moving at a speed of 5 x 10 raise to power 6m/s...
- mechanics- physics - An electron moving at a speed of 5 x 10 raise to power 6m/s...
- Machanics - An electron moving at a speed of 5 multiply by 10 raise to power six...
- college physics - i need solutions for all this problems...help please.... 1.) ...
- mechanics of materials - A metal bar with a cross-sectional area of 50mm2 is ...
- Physics (Mechanics) - An electron of mass 9.1E-31 kg is released from rest at a ...
- physics - An electron is accelerated from rest through a potential difference ...
- Physics (Mechanics) - unanswered - An electron of mass 9.1E-31 kg is released ...
- Physics - In the Bohr model of the hydrogen atom, the speed of the electron is ...

More Related Questions