Homework #11
Due Monday April 28
1. Find some paper or plastic cups that you can destroy for the
advancement of science.
Punch a small hole (perhaps with the point of a pencil) in the bottom
of a cup. Take your cup to a sink and turn on the water so that it
runs slowly. Hold you cup under the water and see what happens. If the
water overflows the cup turn down the flow or punch a bigger hole in the
bottom of the cup. Adjust the flow and hole so that the water reaches a
stable level in your cup. Write down a very brief description of what
you have done so far. Use the word 'equilibrium' in your description.
Next, try increasing or decreasing the flow into the cup by a small amount.
Describe how the level of the water in your cup and the flow out of your
cup change.
Finally, try changing the size of the hole in your cup, while keeping the
flow of water constant. Describe what happens.
Sign your name on your cup and hand it in along with your descriptions.
2. When dry air blows in from the north there is usually a rather large
difference between the daytime and nighttime temperature in Austin, whereas
when the wind blows from the southeast it may get no warmer during the day,
but it doesn't cool off as much at night. Explain why the difference
between the daytime and nighttime temperatures is larger when it is dry out
than when it is humid. Use the phrase 'greenhouse effect' in your answer.
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