PHYSICS ( HEAT)

1.calibration 是應該用boiling water …因為大家都知道,水到了100'C才會變boiling water,所以boiling water永遠是100'C。不過stream可以>100'C,所以不算太正確。
2.sorry,我也不懂
3. bulb前有一段空位?你指的是…bulb和contriction之間位置?
4. The two metal wires joined together at their ends to form two junctions.
One conjunction is kept at a constant temperature (eg.0'C的melting ice) and the other is placed at where the temperature is to be measured.
之後根據ammeter的reading 就會計算到temperature,至於怎樣計算出來,我校的老師也沒有說
5.a. the diameter of the tubes of two thermometer are different/b.the thickness of wall of the glass bulbs are different.Thin wall can facilitate heat transfer,so it has a quicker response(quicker response即是升得較快)
6. all are true
average speed of the water molecules=average kinetic energy of the water molecules=temperature of the cup of water
而 internal energy = K.E.(KINETIC ENERGY) P.E.(POTNETIAL ENERGY)
P.E.沒變,但K.E.下降了,所以也算是下降
7.NO.Heat will only flow from a body with higher AVERAGE KINETIC ENERGY to body with less average kinetic energy ,我想說,heat會transfer 去另一個地方,是因為有temperature different!!而不是因為兩者有internal energy different !!!
8. 首先我懷疑這條問題有錯誤,應該把heat改成internal energy.
internal energy = total K.E. total P.E.
該物質的K.E.跟溫度有關,而該物質的P.E.在不同state有不同數值 (soild state最小, air state最大)hot object的AVERAGE K.E.雖然比cold object高,
但是我們不能說哪個的TOTAL K.E.較高,(一大杯泠水的TOTAL K.E.一定比0.001kg暖水的TOTAL K.E.高吧,明白嗎?)
因為internal energy = TOTAL K.E. total P.E.嘛,所以你知道這個concept就夠了：hot objects must have a higher temperature than cold objects,but not total kinetic energy or internal energy.
9.tea有水,water的specific heat capacity比metal spoon高,所以water每一kg每降一度所release的ENERGY,比metal spoon每一kg每降一度所release的ENERGY高,
1.charles個口溫度較低;2.heat flows from the spoon or tea to him;3.more energy is gained from the tea by charles;4.he feels the tea is much hotter
10.hotter object 同colder object 的接觸面就是medium,conduction沒有接觸面就不可occur
11.yes.because a vacuum flask is used to slow down heat transfer between outside and inside the vacuum flask. HEAT不易走出來,同樣也不易走進去

2008-10-28 22:53:13 補充：
internal energy = TOTAL K.E. + total P.E. (不知道為什麼少了個加號...)

1.不太明白,but when i do experiment, i put the thermometer in water.

2.There is a friction between the liquid & the glass of narrow bend increase because of capillarity.
(http://en.wikipedia.org/wiki/Capillary_action)

3.It can prevent the liquid column from falling back.
Then, the temperature can be read with more time & accuracy.

4.A thermocouple consists of 2 wires of different metals joined at the end to form 2 junction.
The temperature difference causes current flow around circuit. Greater T, greater I, ammeter reading higher = higher T.
It needs a reference temperature, e.g.1 of 2 junction should be put in melting ice.

5.dunno, maybe warm water has heat loss to surrounding.

6.A:true
B:true
C:should be false, cuz the energy is stored inside.(真的不太肯定)

7.No,cuz heat always flows from a body with higher T to a body with lower T.

8.Because heat is the energy transferred through the process of heating but not contained by an object??

9.I guess it's abt. the heat capacity of water & other materials.

10.medium means 媒介. e.g. Puts a spoon into a cup of hot tea. Heat transfer within the spoon. (medium= spoon)

11.未學

2008-10-27 21:52:30 補充：
Cuz those are only what i learned, i dunno if there is any mistake.

您信我用這方法可以幫助您解決身體問題, 碧咸球隊都是用它.
你係咪想型d, fit d又健康d?
我個女13歲, 都是用這方法, 一個月減10磅, 三個月減20磅.
改善鼻敏感, 流鼻血, 靚咗, FIT咗, 讀書仲好咗, 仲拿第一添.
我做文職, 133磅, 160CM , 用咗簡單又健康既方法!
我用左4個月減左20磅, 改善頭痛,胃痛, 暈車浪,植物曲脹, 越來越fit!面色仲好過以前!
網站可以增肥, 減肥, 改善身形, 健康, 體重控制,
美容護膚, http://www.healthcometrue.com/life
[[有營養顧問免費跟進^^ ]]
TEL: 93227176 阿紅