Question

An electron (mass=9.11 X 10^-31kg) leaves a TV picture tube with zero initial speed and reaches the screen 1.90cm away at 3.00 X 10^6 m/s. Ignore gravity and find the net force. (1): 2.28 X 10^-19N (2): 2.28 X 10^-16N (3): None of the above

Answer 1

2.16 × 10^-16N

Step-by-step explanation:

The computation of the net force is shown below:

Data provided in the question

Electron mass = 9.11 × 10^-31kg

V_o = 0

V_f = 3.00 × 10^6 m/s

s = 1.90 cm i.e 1.9 × 10^-2

Based on the above information, the force is

As we know that

`Force\ f = ma = (mv^2)/(2s)\\\\ = ((9.11* 10^(-31))(3* 10^(6))^2)/(2(1.9* 10^(-2)))`

= 2.16 × 10^-16N

Hence, the last option is correct

Basically we applied the above formula to determine the net force