# Plastic Doll

655 Words Apr 20th, 2014 3 Pages
Plastic Doll 1. What is the difference between energy and power? What is a unit of power? How does speed relate to power?

.energy is the ability of doing work while power is the rate at whch work is done unit of power = Watts = 1J/s power = force * velocity 2. Explain how a sound is actually a form of energy? In what medium do sound waves travel?
The longitudinal waves generated by sound will create a wave that transfers at some rate , corresponds to transfer of energy.
They travel in all states of matter, but speed will be different in different matters. 3. Give an example of change of energy from potential to kinetic; from kinetic to potential.
The water falling from the mountains stores kinetic energy.....when
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What makes a good conductor of heat? What makes a good insulator?
Here are a few common examples of conductors: * silver * copper * gold * aluminum * iron * steel * brass * bronze * mercury * graphite * dirty water * concrete
Here are a few common examples of insulators: * glass * rubber * oil * asphalt * fiberglass * porcelain * ceramic * quartz * (dry) cotton * (dry) paper * (dry) wood * plastic * air * diamond * pure water

7. Explain why heat only flows spontaneously from a hot to cold object

Temperature is a measure of the average kinetic energy of the particles in the object. Internal energy is the total energy of the particles in the object. It is not the same then, as it is possible to have objects at a high temperature with low internal energy (eg a spark) and another object at a low temperature but with high internal energy by virtue of its large size ( a bath of warm water) Energy will flow from the object with the highest AVERAGE internal energy to one with a lower average internal energy

8. In what way is aging an example of the second law of thermodynamics?

The second law of thermodynamics states: Natural processes go in a direction that increases the total entropy of the universe. Entropy is a measure of randomness. The more ordered a system is, the less