[請益] 物理底子差~拜託幫忙~真的都不會.....
雖然同學們都說很簡單`但因為自己物理底子真的很不好`連題目都看不太董`
拜託各位告訴我`我明天就要交作業了..現在一題都不會...><||
1.at a certain location, the solar power per unit area
reaching the earth's surface is 200W/m2,average over
a 24-hr day. if you live in a house whose average power requirement
is 3kW and you can convert solar power to electric power with 10% efficiency,
how large a collector area will you need to meet all your household energy
requirements form solar energy? Will it fit in your yard?
2.the heat of vaporization of ethyl alcohol is about 200 cal/g. if 2kg of
this fluid were allowed to vaporize in a refrigerator, how many grams of
ice would be formed from 0'C water?
3.what is the ideal efficiency of an automobile engine in which fuel is
heated to 2700 K and the outdoor air is at 270K?
4.construct a table of all the possible combination of nubers that can
come up when you throw two dice. your friend says,"Yes,I know that seven
is the most likely total number when two dice are thrown. but why seven?
"based on your table answer your friend,and explain that,in thermodynamic,
the situations that are likely to be observed are those that can be formed
in the greatest number of ways.
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