Term
Substance X has a density of 3 g/cc.
It is then cut into three equal pieces which are labeled A, B, and C.
What is the density of piece A? |
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Definition
3 g/cc (the same as the original)
Why: (Tip 1) The same substance always has the same density at the same temp. or pressure. |
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Term
| Substance X is at the top of a mountain. What will happen to its density if it is brought down the mountain? |
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Definition
It will decrease.
Why: (Tip 2) As pressure inc., density does too. (and vice-versa) |
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Term
Substance X has a density of 3 g/cc at 30o C.
When it is heated to 45o C, what happens to the density? |
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Definition
The density will dec.
Why: (Tip 3) As temp. inc., density dec. (and vice-versa). |
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Term
| Explain why frost action occurs. |
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Definition
Water expands when it freezes, splitting open any cracks it may have been in.
Why: (Tip 4) Water expands when it freezes. |
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Term
| Why can scientists predict tides and phases of the moon? |
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Definition
They are cyclic changes.
Why: (Tip 5) Most changes in the environment are cyclic. |
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Term
| What state is H2O in when it is densest? |
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Definition
Liquid.
Why: (Tip 4) Water is densest at 4o C in the liquid phase. |
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Term
| Is Earth a perfect sphere? |
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Definition
No.
Why: (Tip 7) the true shape of Earth is an oblate spheroid (slightly flattened at the poles) |
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Term
Which is the best model of Earth?
a. a perfect sphere
b. an egg
c. a football |
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Definition
a. a perfect sphere
Why: (Tip 8) it is only slightly flattened at the poles |
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Term
| A sailor at sea measures the altitude of Polaris as 55. Where is he? |
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Definition
55oN
Why: (Tip 9) the altitude of Polaris is your latitude (in the N. Hemisphere) |
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Term
Billy is doing a lab. He measures the altitude of the sun at Saratoga as 53o.
Using his information, what is the circumference of Earth? |
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Definition
It cannot be calculated.
Why: (Tip 10) the altitude of the Sun at two locations is needed |
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