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Wednesday, Jan. 29, 2014. Collect homework – page 9 Start on section 2 – about air pressure. We will examine density and volume, today. Make certain you have today’s notes in your notebook. Agenda entry – No homework.

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## Wednesday, Jan. 29, 2014

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**Wednesday, Jan. 29, 2014**• Collect homework – page 9 • Start on section 2 – about air pressure. We will examine density and volume, today. • Make certain you have today’s notes in your notebook. • Agenda entry – No homework.**You decide you want to carry a boulder home from the beach.**It is 30-cm on each side and so has a volume of 27,000-cubic centimeters. It is made of granite, which has a typical density of 2.8-grams/cubic centimeters. How much will the boulder weigh?**You decide you want to carry a boulder home from the beach.**It is 30-cm on each side and so has a volume of 27,000-cubic centimeters. It is made of granite, which has a typical density of 2.8-grams/cubic centimeters. How much will the boulder weigh? • 30-cm on each side (v=l*w*h) • Which means volume is 27,000-cubic centimeters. • Density = 2.8-grams/cubic centimenter • What is mass?**A golden-colored cube is handed to you. The person wants**you to buy it for $100, saying that is a gold nugget. You know real gold has a density of 19.3-grams/cubic centimeter. You measure the cube and find it is 2-cm on each side, and weighs 40-grams. What is its density? Is this gold? Is it a good buy?

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