5/11/09

Hey guys!

So today, we finished correcting the worksheet "Electric Potential"

1) V = PE/Q
5.0x10^-18/1.6x10^-19
= 31V

2a) ( 9x10⁹)(2X10^-16)(2X10^-10)
= 3.6X10^-12
(3.6X10^-12)(0.01)
= 3.6X10^-14 JOULES
2b) V=PE/q
= 3.6x10^-14/2.0x10^-16
= 180V

3)Ek= qV
(1.6x10^-19)(1000 V)
= 1.6 x 10^-16J
Ek= 1/2 mv²
v= sqrt( 2(1.6x10^-16/9.11x10^-31)
= 1.9x10⁷ m/s
4) V= kQq/r
=9x10⁹ (3.0)(1.6X10^-19)/ 0.80
= 5.4 x10^-9
V= kQq/r
= 9x10⁹ (3.0)(1.6X10^-19)/ 0.5
= 8.64x10^-9

W= V2-V1
= 8.64x10^-9 - 5.4 x10^-9
= 3.24x10^-9 J

5a) W= qV
= (1.6x10^-19)(12)
= 1.92x10^-19J
OR
= (1.92x10^-18J/ 1.6x10^-19 )
= 12eV electronvolt
b) same amount = 1.92x10^-18J or 12eV

c) Ek= 1/2mv²
= sqrt( 2(1.92x10^-18/ 9.11x10^-31)
v= 2.05x10⁶ m/s

after we corrected the worksheet, we did a lab:

Chapter 21: Charges, Energy, Voltage

which is due tomorrow, so don't forget to hand it in.
Also don't forget to do your research paper, its due Friday !

George will scribe tomorrow, since he didn't do it last week =P

* correct my mistakes when you see some , please and thanks*

=)