1. Heat engines use thermal energy by heating up the substance inside. When it heats up, turns into a gas, and expands it is then pushed through the turbine. The turbine uses it to power the engine.
2. In an internal combustion engine the feul is burnt inside the cylinder(diesel engine) whereas an external combustion engine the fluid is being heated from an external source. They are similar b/c they both burn/process feul inside of the engine.
3. They use internal combustion engines b/c it would take a lot more feul and work to keep the car running,
4. Evaporation and Condensation occur
5. If the compressor stopped working then the refrigerator wouldn't work because the compressor is the motor and if broke then it wouldn't run and it would get hot inside.
Thursday, November 18, 2010
Objective 4 for Homework 9
1. Thermal Energy
2. The particles start bouncing around faster and at a certain temperature it changes state.
3. B/c all of its energy is being put into changing state so it doesn't have enough energy to warm the substance as well.
4. It melts b/c the thermal energy in its surroundings. When the thermal energy around it causes the particles in the solid to bounce around and expand it makes it hard to stick closer together. After a certain amount of heat has been applied to the solid, the particles bounce around so much that they expand and take on a new shape as a liquid.
5. Because when it is heated up, (convection) the water in the potato expands. The skin prevents it from expanding any further so therefore it explodes. If you poke holes i the potato then the water will evaporate out of the potato.
2. The particles start bouncing around faster and at a certain temperature it changes state.
3. B/c all of its energy is being put into changing state so it doesn't have enough energy to warm the substance as well.
4. It melts b/c the thermal energy in its surroundings. When the thermal energy around it causes the particles in the solid to bounce around and expand it makes it hard to stick closer together. After a certain amount of heat has been applied to the solid, the particles bounce around so much that they expand and take on a new shape as a liquid.
5. Because when it is heated up, (convection) the water in the potato expands. The skin prevents it from expanding any further so therefore it explodes. If you poke holes i the potato then the water will evaporate out of the potato.
Objective 3 for Homework 9
1. convection, conduction, radiation
2. Heat always rises.
3. A conductor transfers heat well and allows it to move from one place to another and insulators do not transfer heat well and keep the heat in a certain substance. Metal is a conductor and a wool blanket is an insulator.
4. It would work better as a conductor because it has low resistence. If something has low resisitance it means that it is easier to move electrons through. Since thermal heat is transfered through electrons it makes it easier for thermal energy to pass through it.
5. Personally I would build a fire. I would do this because although putting up a tent(which is convection) would help, it wouldn't be as warm. If I were to build a fire, that would be radiation and I would become warmer faster.
2. Heat always rises.
3. A conductor transfers heat well and allows it to move from one place to another and insulators do not transfer heat well and keep the heat in a certain substance. Metal is a conductor and a wool blanket is an insulator.
4. It would work better as a conductor because it has low resistence. If something has low resisitance it means that it is easier to move electrons through. Since thermal heat is transfered through electrons it makes it easier for thermal energy to pass through it.
5. Personally I would build a fire. I would do this because although putting up a tent(which is convection) would help, it wouldn't be as warm. If I were to build a fire, that would be radiation and I would become warmer faster.
Monday, November 15, 2010
Objective 2 for Homework 9
1. Bulb thermometers measure temperature with alcohol or mercury. When you put the thermometer into the thing or person that you need to know the temperature of the mercury/alcohol expands/ shrinks with changes with temperature difference so when you put it into a cup of water that is 40 degrees Fahrenheit, it shrinks to that number on the side of the thermometer.
2. They are alike because they all measure temperature. They are different because each scale is different. For example, 32 degrees Fahrenheit is equal to 0 degrees Celsius.
3. 5.0 Celsius equals 41 degrees Fahrenheit.
4. 460 degrees Fahrenheit.
5. It would take 50K.
(I would like to thank wiki.answers.com/ for giving me the formula for the last one).
2. They are alike because they all measure temperature. They are different because each scale is different. For example, 32 degrees Fahrenheit is equal to 0 degrees Celsius.
3. 5.0 Celsius equals 41 degrees Fahrenheit.
4. 460 degrees Fahrenheit.
5. It would take 50K.
(I would like to thank wiki.answers.com/ for giving me the formula for the last one).
Objective 1 for Homework 9
1. The three commons temperature scales are Fahrenheit, Celsius, and Kelvin.
2. Temperature is the measure of how much thermal energy something has and heat is what atoms give off when they bounce around and produce thermal energy.
3. Well, the specific heat of something is the amount of heat per unit of mass it takes to raise the temperature 1 degree C so if something has a high specific heat then it means that it takes more heat to raise the temperature of one unit of mass by 1 degree C.
4. Because the thermal energy from your hand causes the ice cube's atoms to start moving faster. So fast that they can stay a solid anymore so it becomes water.
5. Because some things are denser than others and have more mass so therefore they have a higher specific heat.
2. Temperature is the measure of how much thermal energy something has and heat is what atoms give off when they bounce around and produce thermal energy.
3. Well, the specific heat of something is the amount of heat per unit of mass it takes to raise the temperature 1 degree C so if something has a high specific heat then it means that it takes more heat to raise the temperature of one unit of mass by 1 degree C.
4. Because the thermal energy from your hand causes the ice cube's atoms to start moving faster. So fast that they can stay a solid anymore so it becomes water.
5. Because some things are denser than others and have more mass so therefore they have a higher specific heat.
Thursday, November 11, 2010
Objective Six for Homework 8
1. Charles Law states that when the pressure and mass of a gas remains the same and the temperature is increased, therefore volume is increased.
2. quickly
3.Jacques Charles and Nicolas Robert were the first to fly
4. When Robert stepped out the balloon shot over 9,000 feet in the air.
2. quickly
3.Jacques Charles and Nicolas Robert were the first to fly
4. When Robert stepped out the balloon shot over 9,000 feet in the air.
Objective Five for Homework 8
2. because when the balloon's distance from the earth increases the pressure increases so therefore the balloon expands. if the balloon expands too much then it will pop.
3. pressure*volume=constant
4. physicians use Boyle's law to draw blood or to give shots.
5. SCUBA divers use Boyle's law to know how much oxygen they will need.
3. pressure*volume=constant
4. physicians use Boyle's law to draw blood or to give shots.
5. SCUBA divers use Boyle's law to know how much oxygen they will need.
Objective Four for Homework 8
1. At a warmer temperature there is more energy and at a cooler temperature there isn't as much energy.
2. Because the thermal energy causes the particles in the ice cream to start moving faster and so therefore don't hold their shape.
4. when the particles in a gas slow down from cooling and they turn back into a liquid because they have slowed down so much.
5. when a solid heats up at a rapid pace
2. Because the thermal energy causes the particles in the ice cream to start moving faster and so therefore don't hold their shape.
4. when the particles in a gas slow down from cooling and they turn back into a liquid because they have slowed down so much.
5. when a solid heats up at a rapid pace
Objective Three for Homework 8
2. Kinetic
3. Potential
4. Energy in the frequency of waves such as radio waves and gamma rays.
5. Electric energy. what powers the computer that you are reading this off of.
3. Potential
4. Energy in the frequency of waves such as radio waves and gamma rays.
5. Electric energy. what powers the computer that you are reading this off of.
Objective Two for Homework 8
1. In a chemical change the make up or identity of the substance changes. In a physical change, only the way it looks, feels, etc. changes. Such as water turning to ice.
3. The Law of Conservation of Mass was created by Antoine Lavoisier and it states that the mass of the substances before the reaction= the mass of the product of the reaction
4. Temperature is a measure of how fast the particles of something are moving and thermal energy is the energy that the particles give off when they move faster.
5.Endothermic:baking soda and vinegar, Exothermic: chlorine and sodium(table salt).
3. The Law of Conservation of Mass was created by Antoine Lavoisier and it states that the mass of the substances before the reaction= the mass of the product of the reaction
4. Temperature is a measure of how fast the particles of something are moving and thermal energy is the energy that the particles give off when they move faster.
5.Endothermic:baking soda and vinegar, Exothermic: chlorine and sodium(table salt).
Objective One for Homework 8
1. Matter is more useful because weight is the amount of gravitational force the earth has on your body. If you went to the moon you would weigh less because the moon is smaller so therefore it has less gravitational pull. But mass is a measure of how much matter you or an object is made of. so if you went to the moon and calculated the amount of mass your body has, it would be the same on earth.
2. 619.65 centimeters cubed
3. "unit of mass" per "unit of volume cubed"
4. mass/volume=density
5. length*width*height=volume
2. 619.65 centimeters cubed
3. "unit of mass" per "unit of volume cubed"
4. mass/volume=density
5. length*width*height=volume
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