Re: Maple TA 23_2

k8 on Tue Mar 31, 2009 1:07 pm

finally i got a 100%. apparently you have to raise all you #s to 10^x not e^x. how do you know which one to use when?

MAGGuest on Wed Apr 01, 2009 12:43 am

"e^x" is completely different from "E^x"... "E^x" is "10^x"

TI_83 on Wed Apr 01, 2009 7:55 am

3. An electron moves with 88.76 % of the speed of light. By which factor is the moving mass larger than the restmass (sheet 17) ? Indicate with a negative (positive) sign whether the moving mass is infinite (finite) wenn you set the electron speed equal to the speed of light.
This one involves a little bit of work:
=(9.10938188E-2/(sqrt(1-(.8876)^2))
=1.97765608E-27
NOT FINISHED YET
=(1.97765608E-27)/(9.10938188E-2
=2.171010181 (NEGATIVE)
If you plug your numbers into the way I have mine set up as above, you will get the right answers, make sure your parenthesis are appropriate.

I'm not sure what number you're using for the mass of an electron. Isn't it 9.10938188E-31 kg? When I use that number in the equation I am required to multiply the final result by 10 in order to get the answer maple accepts, any idea what the deal with this is? Does the equation require non-SI units? (grams?)
Thanks

bmb on Wed Apr 01, 2009 3:18 pm

To TI 83:

Doesn't matter if you use either 10^-28 or 10^-31, because you're finding a ratio. As long as you are consistent throughout the problem, you should get the same answer.

I used 9.11x10^-31 in my calculator and it worked fine.

Maple TA 23_2

ugh

Re: Maple TA 23_2

3

Question 3