The diameter of the Milky Way disc is approximately
9 x 10^20 meters. How long does it take light, traveling at 10^16 m/yearto travel across the diameter of the Milky Way?
2006-09-03 09:56:24 · 7 answers · asked by superhomer1221 2 in Science & Mathematics ➔ Mathematics
a.) 9,000 b.) 900,000 c.) 900 d.) 90,000
2006-09-03 10:17:42 · update #1
The latest info on the width of the Milky Way is about 160k to 180k light years across. So.... the closest answer to that is 9k. => D. 90000.
But the math way works too. 9e20/1e16 = 9e4 or 90000 years.
2006-09-03 10:24:51 · answer #1 · answered by macearth2000 2 · 0⤊ 2⤋
Do not feel dumb. Most people know that the distance traveles can be calculated by taking the velocity of the traveler times the duration of the travel: D = V * T
This means that the Time can be found from: T = D / V
You state that the Distance = 9 x 10^20 meters and the Velocity = 1 x 10^16 meters/year.
D = 9 x 10^20 meters / 1 x 10^16 meters/year
= 9/1 x 10^20/10^16 years
= 9 x 10^4 = 90,000 years
The answer is (d).
2006-09-03 10:19:54 · answer #2 · answered by Richard 7 · 7⤊ 0⤋
Time of travel = distance divided by velocity.
In your problem, distance = diameter of the Milky Way, and velocity = light velocity. You should be able to get it now:
T=9*10^20 m / 10^16 m/yr = 9*10^4 yr
2006-09-03 09:59:33 · answer #3 · answered by gp4rts 7 · 0⤊ 0⤋
80 light years
2006-09-03 10:04:28 · answer #4 · answered by Sugars 3 · 0⤊ 1⤋
enable the fee of the paperback version be x. for this reason the fee of the no longer user-friendly-disguise version could be 3x. 3x + x = 26.60 4x = 26.60 x = 6.sixty 5 fee of paperback version = $6.sixty 5. fee of no longer user-friendly-disguise version = 3 X 6.sixty 5 = $19.ninety 5.
2016-12-18 04:14:16 · answer #5 · answered by ? 4 · 0⤊ 0⤋
Gee, man, you got all the numbers staring right at you.
You have distance (9e20 m) and speed (1e16 m/year), you simply divide one by the other:
9e20/1e16 = 9e4 or 90000 years.
2006-09-03 09:59:39 · answer #6 · answered by Vincent G 7 · 1⤊ 1⤋
11.25 yrs. Don't quote me. 9*((10*10)*20)/(10*10)*16=11.25
2006-09-03 10:03:22 · answer #7 · answered by What, what, what?? 6 · 0⤊ 1⤋