Wednesday, November 17, 2010

HomeWork 9, Bring the Heat!!!!! part 1

I.1 Fahrenheit, Celsius, and Kelvin.
I.2 Thermal Energy is the energy released when particles move quickly. Temperature is the expression and measurement of thermal energy and heat. Heat is the transfer of thermal energy from one thing to another.
So thermal energy controls heat and temperature, heat is the transfer of thermal energy changing temperature, and temperature is the measurement of the two, usually using thermometers.
I.3 Specific heat is the amount of energy needed to change a substance in temperature. If something has a high specific heat, then it needs a large amount of energy to change the temperature.
I.4 When you hold an ice cube, your hand transfers your body heat from your hand to the ice cube, causing it to exceed its melting point, turning it into a liquid.
I.5 Everything has a different specific heat. The lower it is, the quicker it will heat up. So the reason some things heat quicker is because they have a low specific heat. There are other factors such as conduction, but that is the main reason.

II.1 The mercury in the thermometers expand when it increases, causing the mercury to rise, hence the rising liquid within them.
II.2 They all give value of temperature. Celsius is based off of the boiling and freezing point of water. Kelvin is based off of absolute zero, while Fahrenheit is based of the freezing and melting point of a mixture of salt, water, and ice.
II.3 41 degrees F
II.4 460 degrees C
II.5 109,000 J

III.1 Conduction, Radiation, Convection
III.2 Hot to Cold. Always. Always.
III.3 Conductors transfer heat very well. Insulators trap and do not transfer heat.
III.4 Conductor. This is because metals are usually good conductors and heat travels through them very easily.
III.5 I would choose a fire. The best way to stay warm is to trap the heat instead of created mass amounts of it. If you use your body heat and trap it using layers and a tent, then you will be able to stay warmer than standing near a large heat source, for that source's heat is expelled, and little of the heat actually reaches you.

IV.1 Temperature, Pressure, and Heat Energy.
IV.2 It heats up, and eventually melts or burns.

II.3

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