B-field question Lorentz's force

[flyingpig]

Ah Yes, the m lol

 

[SammyS]

Are we squared away?

You should be able to give a numerical answer.

 

[flyingpig]

a) 1.79 x 10^-8s

b) 5.63 x 10^-18J

Unless I made a mistake typing in my numbers.Sammy, I also noticed that you could do this

The arc length is \pi (2.00 \times 10^-2)

The speed is then

\frac{\pi (2.00 \times 10^-2)}{1.79 \times 10^-8}

Then I also get the same KE!

 

[flyingpig]

Also, Sammy, when I calculated the velocity I used the average velocity formula and I forgot to divide it by 2. I should have used the change in velocity. My question, how come they don't give the same answer?

 

[SammyS]

The speed doesn't change.