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# Wednesday 9-24-14 PowerPoint PPT Presentation

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. B. F. A. G. E. C. D. Irregular. Spiral. Elliptical. Distances in the Universe.

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Wednesday 9-24-14

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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

B

F

A

G

E

C

D

Irregular

Spiral

Elliptical

### Distances in the Universe

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

Anything divided by itself is one!

ANYTHING divided by itself is one!

1.6

8 km

1

300,000 km

300,000 km

= 3,000,000 km

9.5 trillion km

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

=

### To Do:

• # 11

• Finish Distance in Universe WS

4.5 trillion km = 1 light year.

1

4,500,000,000,000