Question

I am stuck on one question and I am lost. @vocaloid

Answer 1

Find the force (in N) of electrical attraction between a proton and an electron that are 8.5 ✕ 10−11 m apart.

Answer 2

10^-11

Answer 3

F = k(q1)(q2) / r^2

where k is coloumb's constant (8.987 * 10^9)
and q1 and q2 are your charges

for a proton, charge is (1.6 * 10 ^ - 19) C
for an electron, charge is - (1.6 * 10 ^ - 19) C
r is distance (8.5 ✕ 10−11 m)

Answer 4

force is a vector, so in this case it *should* be negative, but if that doesn't work, they may be looking for the magnitude only

Answer 5

this is the constant I have

Answer 6

if they tell you to use 9.0 * 10^9 then go ahead and use that. it's rounded to make calculations easier.

Answer 7

so for the top part my calculator got -2.304e-28

Answer 8

yeah that's about right

Answer 9

I got -3.19 unless they want me to put all of these numbers in

Answer 10

well it said the -3.19e-52 is wrong I have one more attempt left I was following what the example did

Answer 11

I think you may have forgotten the negative sign on the lower exponent

(9 * 10^9)(1.6 * 10 ^-19)^2 / (8.5 ✕ 10^−11 m)^2 = -3.19 * 10^(-8)

out of curiosity, did the example have a positive or negative sign?

Answer 12

it was 3.89e-08 the example's answer

Answer 13

so maybe I should try 3.19e-08?

Answer 14

another example says 2.78e-08 so I am guessing that's how the program wants the answer set up

Answer 15

yeah

Answer 16

It was 3.19e-08!
Compare this to the gravitational force between these particles. (Enter the gravitational force, in N.)

How do I do this part?

Answer 17

gravitational force has a very similar formula

Force of gravity = G(m1)(m2) / r^2

G is a different constant (6.67 * 10^(-11))
m1 and m2 are the masses of the electron and proton, in kg
r is distance

mass of proton: 1.6725 × 10^−27
mass of electron: 9.10938 * 10^-31
distance is the same as before, 8.5 ✕ 10^−11 m

Answer 18

1.41 is what I have but I need an e to something

Answer 19

It gives me 1.40702658e-91 in my calculator

Answer 20

e-91? I got e-47 when I used my calculator

Answer 21

interesting my calculator is weird I guess

Answer 22

yayyyyyy I did it! Thank you!