# Problem: a) The distance to polaris, the north star is approximately 6.44 ×1018 m, if polaris were to burn out today how many years will it take to see it disappear? b) how long does it take sunlight to reach the earth?c) how long does it take a microwave signal to travel from the earth to the moon and back?

###### FREE Expert Solution

Time is expressed as:

$\overline{){\mathbf{t}}{\mathbf{=}}\frac{\mathbf{d}}{\mathbf{c}}}$,

90% (346 ratings) ###### Problem Details

a) The distance to polaris, the north star is approximately 6.44 ×1018 m, if polaris were to burn out today how many years will it take to see it disappear?

b) how long does it take sunlight to reach the earth?

c) how long does it take a microwave signal to travel from the earth to the moon and back?

Frequently Asked Questions

What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Satellite Motion: Speed & Period concept. You can view video lessons to learn Satellite Motion: Speed & Period. Or if you need more Satellite Motion: Speed & Period practice, you can also practice Satellite Motion: Speed & Period practice problems.