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## PowerPoint Slideshow about ' Wednesday 9-24-14' - yetta-chan

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Wednesday 9-24-14

- Clear off desk – Pop QUIZlet!
- When finished with quizlet place upside down on floor
- Read & answer questions on pp.280-281

Distances in the Universe

Any value will fit into it’s own value exactly ONCE!

9.5 trillion km/year

= 9,500,000,000,000

9.5 trillion

9,500,000,000,000

=47.5 trillion

km

1

47,500,000,000,000 km

=47.5 x 1012

To set up your problems

10. How many km is a star that

is 20 light years away.

20 ly

- Write what value you are given to start your problem.
- Put the unit of the starting value on the bottom of your conversion factor.
- Put the unit you are changing it to on the top
- Write in the values of the 2 units that are equal.
- Do the math & cancel units

km

9.5 trillion

1

_________________

ly

190 trillion km

You can cancel places of 10!

- For Example working problem 10 backwards:

190,000,000,000,000 km = how many light years?

190,000,000,000,000 km x 1 ly

9,500,000,000,000 km

190,000,000,000,000 km

9,500,000,000,000

190,000 km

9,500

=

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