Question

The distance from Earth to the Moon is approximately 240,000 mi.
The speed of light is 3.00 * 10^8 m/s. How long does it take for light to travel from Earth to the Moon and back again?
Please Show work.

Answer 1

time from the earth to the moon = 240000m /(3.00*10^8)m/s
time = .0008s
therefore to the moon and back = .0016s

Answer 2

understand?

Answer 3

well its miles to meters

Answer 4

so first have to convert

Answer 5

oh ok ill fix it then thx

Answer 6

1 mi = 1609.34 m

Answer 7

kk

Answer 8

but i do understand what you did and thanks

Answer 9

this dimensional analysis stuff does not agree with me at times lol

Answer 10

ok then make the correction and it'll look like this

time = 240000*1609.34/(3*10^8)

Answer 11

haha kk :)

Answer 12

n of course multiply the answer by 2

Answer 13

you could just begin with 480000 right?

Answer 14

yea u could just because its doesnt throw off the working

Answer 15

480000 mi * 1609.34m/mi * s/300000000

Answer 16

300000000 m oops

Answer 17

if this is home work then you shouldnt multiply by 2 first actually cause yes you'll get the rigt answer but when u write ur statements u'll have to explain y u muliplied by 2 n it makes more sense to do it after

Answer 18

i still get the wrong answer i think >.< i get 2.57 s

Answer 19

yea that is the correct answer

Answer 20

(4800000 * 1609.34)/300000000 = 2.57s

Answer 21

yep

Answer 22

k thanks a ton

Answer 23

sure thing :)