One physics question (10 marks will be given)

billyhorsewater2620888

2006-10-24 5:52 am

1(a)The resistance of a wire is 5 units in ice and 6 units in steam. Its resistance becomes 7 units when heated by a flame.
The calculation:
T=a-b/c-b X 100 = 7-5/6-5 X 100 = 2/1 X 100 = 200 degree C

(b) State the assumption in your calculation.
How to answer this question (1b)?

更新1:

Come on boys and girls! I need your help. Thanks!

更新2:

Please answer in English, thanks!

更新3:

Notes (The calculation): T= unknown temperature a= units of the wire at the unknown temperature b= units of the wire at 0 degree Celsius c= units of the wire at 100 degree Celsius

回答 (2)

路人甲

2006-10-24 6:04 am

✔ 最佳答案

1(a)The resistance of a wire is 5 units in ice and 6 units in steam. Its resistance becomes 7 units when heated by a flame.
The calculation:
T=(a-b)/(c-b)x100 = (7-5)/(6-5)x100 = (2/1)x100 = 200℃
(b) State the assumption in your calculation.
假設導線的電阻在這溫度的範圍內，它的電阻受熱是均勻地增加。

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Joe

2006-10-24 11:34 pm

assume the resistance of the material is direct proportional to the temperature.

Reason: there coefficient of resistance relayed to temperature is constant. Thus, the realationshop of resistance and temperature is assumed to be a stright line in the graph.

You could find it form high level physics' book, the relation of them isn't direct for experimental result. Actually, that's a curve.

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