1.What is the difference between energy and power? What is a unit of power? How

Question

1.What is the difference between energy and power? What is a unit of power? How does speed relate to power? 2.How is sound actually a form of energy? In what medium do sound waves travel? 3.Give an example of change of energy from potential to kinetic; from kinetic to potential. 4.What is a trophic level? Give some examples. How much energy is lost at each trophic level? 5.If you eat 600 calories per day (roughly one dessert) below your energy needs, how long would it take to lose 10 pounds? How long would you have to walk (assuming 80 calories burned per mile walked) to lose 10 pounds? 6.What makes a good conductor of heat? What makes a good insulator? 7.Why does heat only flows spontaneously from a hot to cold object. 8.In what way is aging an example of the second law of thermodynamics? 9.If traveling to Europe, and the weather forecast says it is going to be 38oC. Should you wear shorts of a down jacket?

Explanation / Answer

1.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. the logitudnakl wabes generated by this sound will create a wave that tranfers at some rate , corresponds to transfeer of enegy.

it travels in all staes of matter, but speed will be different in dfferent matter

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