Phy Mc 一題

actually,
average KE= (total KE)/(amount of matter)

simlilarly,
average speed=(total distance)/(time)



(3) correct.
Heat is defined as the thermal energy transferrd due to temperature difference of two bodies.
So the direction of heat flow depends on temperature.



you are correct for: temperature is a measure of avg KE
but temperature is also responsible for deciding the direction of heat flow

another example:
density is the measure of amount ot matter per unit volume
desity is a property that decide the buoyancy

2008-03-11 15:27:26 補充：
two is correct
you said temperature is the measure of average KE
however if you don't measure the total KE, how can you deduce the avg KE?

2008-03-11 15:27:30 補充：
it's a problem about statistics
any change in the total value/mean value would in turn change another one
i.e. mean value and total value are interrelated

please don't stick to the wordings, tune you mind about maths

第３應該係解　
如果呢舊野（ａ）放左係舊比佢熱ｄ既野（ｂ）到　
能量就會由（ｂ）去（ａ）喇
但如果（ａ）放係舊比佢凍ｄ既野（ｃ）到
能量就會由（ａ）去（ｃ）喇

所以就係ｃｏｎｔｒｏｌ　ｔｈｅ　ｄｉｒｅｃｔｉｏｎ　ｏｆ　ｈｅａｔ　ｆｌｏｗ

2008-03-10 22:25:03 補充：
你話temperature is a measure of average ke, not total ke
點解你又會覺得２岩？？
可能係我理解錯．．