Welcome to ASTR 105 Lab! Review the Syllabus Notes for Lab 1.

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Presentation transcript:

Welcome to ASTR 105 Lab! Review the Syllabus Notes for Lab 1

The Metric System Objects we deal with in astronomy cover many size scales: The metric system provides a useful notation to cover these scales.

Astronomical Units In many cases we have to use units which span even larger size scales. The "Astronomical Unit" (AU) is shorthand for the distance between Earth and the Sun, and is useful for measuring solar system distances. The "light year" is the distance light travels in a year, and is useful for measuring the distance to stars.

Changing Units and Scale Conversion I want to take a trip to Saturn for Spring breakto rollerblade around the rings. I know I can rollerblade at 10 feet per second. I want to know what this is in kilometers per hour so I can figure out how many hours this is going to take me. This requires changing my units, and scale conversion with my Saturn map.

Changing Units First we need our distance conversion factor: 1 foot = 0.3 meters The nice thing about the METRIC system is that conversion between metric units just involves powers of ten. (1000 m = 1 km)‏ There is nothing special about time in the metric system. We will continue to use hours, minutes, seconds, etc.

Scale Conversion Now I need to know the scale on this map to learn the distance around the rings. Using the scale given in the bottom left corner of the image, I measure with my ruler that 100,000 km is equal to five inches.

Scale Conversion, cont'd. This gives us a SCALE FACTOR of 1 in = 20,000 km I also measured the distance around the rings with my ruler to be 140 inches. To find the actual distance in km, I multiply my scale factor by the distance I measured on the map. Note, you probably will not be getting the exact answer, but you should be getting something close.

Changing Units and Scale Conversion, fin. Now that I know my speed, and my distance, I can calculate the time it will take me to rollerblade around Saturn's rings! Looks like I will not be wasting my time attempting this feat... further unit conversion reveals this is about 30 years.

Squares, Roots, and Exponents

Scientific Notation

Scientific Notation + Math

Graphing/Plotting

Plotting, cont'd.