Physics homework HELP!!!?

Question

Ok help me out with these questions. These are due tomorrow with a bunch of other ones so i need all the help i can get. Thanks

1.Why is the constant temperature of boiling water on a hot stove evidence that boiling is a cooling process?

2.Will potatoes boiling in a pot of water cook faster if the water is boiling vigorously than if the water is boiling gently?

3. People who live where snowfall is common will attest to the fact thats air tempuratures are always higher on snowy days than on clear days. Some people get cause and effect mixed up when they say that snowfall cannot occur on very cold days. Explain.

4. On cold winter days the windows of your warm home sometimes get wet on the inside. Why is this so?

Answer 1

1. Water boils at 100 C. and changes to steam at 100 C. This is called a change of state from a liquid to a gas. During the change of state, no temperature change occurs. Boiling is not a cooling process but a change of state process.

2. The temperature of the water is a constant 100 C. so it doesn't matter. A vigorous boil is simply creating 100 C steam at a faster rate.

3. Snow is created from moisture in the air. In order to freeze, the water must change its state from a liquid to a solid which is another change of state. In order to freeze, water must loose heat to change to a solid. This heat is absorbed by the atmosphere. On very cold days it is possible for snow to fall. This requires that the water vapour skips the liquid phase and sublimates directly to a solid. When this happens, snow can fall from a clear sky.

4. Condensation. The change of state from a vapour to a liquid. The cold window reduces the temperature of the air causing the water vapour to condense. Cold air cannot hold the same amount of water vapour as warm air.

Answer 2

1. No mater how much energy we add the temperature does not exceed boiling temperature.

2. From answer of one it would make no difference since the temperature will be the same.

3. True but ...The only plausible explanation is that warmer temperatures cause greater evaporation. More moisture in the air leads to heavier precipitation.

4. This is due to condensation of water vapor when it comes in contact with cold glass.

Answer 3

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