Extra Problems - Introduction
You will find the following numbers useful. The speed of light is 3x105 km-sec-1.
1 AU is 1.5x108 km.
One year = about 3x107 seconds.
1 light year is about 1013 km.
- 104x106 = ?
- (1016)1/2 = ?
- 6x102x3.5x103 =?
- (64x108x36x1012)1/2 = ?
- How long does it take light to travel from the Sun to Jupiter? (Jupiter is roughly 5 AU from the Sun).
- A radar pulse takes 2 hours to travel from Earth out to an asteroid and return. How far away is the asteroid?
- Two galaxies are moving apart at 15,000 km/sec. If they are 6x108 ly apart, how long ago did they begin moving apart (assume they separate at a constant speed). Note: Be sure not to mix light years and km as units here. Convert one to the other, it doesn't matter which.
- In the previous problem, you got an answer in seconds. How many years is it?