One
Givens
- v = 8.5 km/s = 8500 m/s
- R = 25 cm = 0.25 m
- B = 5.29 * 10^-3
- q = 1.6*10^-19
- m = ??
Formula
m*v^2/ R = qvB Cancel 1 v on each side.
m*v / R = q*B
which for m when transposed is
m = q*B*R/v
m = 1.6*10^-19 * 5.29*10^-3 * 0.25 / 8500
m = 2.49 * 10^-26
Answer: A
Two
Givens
- B = 0.5 T
- q = 1.6 * 10^ -19
- v = ??
- m = 3.34 * 10^-27
- R = 55.6 cm = 0.556 m
Formula
qvB = mv^2/R Cancel one of the "v"s
qB = mv/R
qBR / m = v
Solution
1.6*10^-19 * 0.5 T * 0.556 m / 3.34 * 10^-27
13317365 = v
1.33 * 10^7 = v
