Answer: A) Force = 3.841*10^-18 N.
B) force (f) is 4.30* 10^12 times greater than the weight (Fg).
Explanation: mass of electronic charge = 9.11*10^-31kg
v = final velocity = 6.80*10^5 m/s
u = initial velocity = 2.40 * 10^5 m/s
S= distance covered = 4.8cm = 0.048m
a = acceleration
Since the acceleration of the electron is assumed to be constant, newton's laws of motion are valid.
Thus, recall that
v² = u² + 2aS
(6.80*10^5)² = ( 2.40*10^5)² + 2*a( 0.048)
46.24 * 10^10 = 5.76 * 10^10 + 0.096a
46.24 *10^10 - 5.76* 10^10 = 0.096a
40.48* 10^10 = 0.096a
a = 40.48 * 10^10/0.096
a = 4.2167*10^12m/s².
Force = mass * acceleration
Force = 9.11*10^-31 * 4.2167*10^12
Force = 3.841*10^-18 N.
Weight =Fg= mg where g = acceleration due gravity = 9.8m/s²
Fg= 9.11*10^-31 * 9.8
Fg = 8.9278* 10^-30 N
By comparing the force and the weight, we have that
F/Fg = 3.841 * 10^-18/8.9278 * 10^-30 = 4.30* 10^12.
This implies that the force (f) is 4.30* 10^12 times greater than the weight (Fg).
