physics question

Question

One of the fundamental subatomic particles is the electron. It has a negative charge and a mass of 9.11  10^-31 kg. A certain electron has a speed of 4.00  10⁵ m/s initially. Its speed increases to 6.60  10⁵ m/s over a distance of 5.20 cm. Its acceleration is constant.

a- Determine the magnitude of the force exerted on the electron.

__?___ N

b- Compare this force (F) with the weight of the electron (F_g), which we ignored.

F/ F^g= _?___

Answer 1

First, let's get the acceleration by using Vf^2 = Vo^2 + 2aD where a and D are the acceleration and distance traveled respectively. Substitute and solve for a.

Next use F = ma to get the force necessary to move the electron.

The weight of the electron is mass x gravitational acceleration = 9.11 x 10^-31 kg x 9.8 m/s^2.

Calculate the force divided by the electron weight to get part b.

Remember to use the correct units.