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標題: [Physic試題](heat) [打印本頁]

作者: FreedomJustice 時間: 2006-11-8 09:04 PM 標題: [Physic試題](heat)

Concept Test (2001)
A melting ice block of mass 0.05kg is mixed with x kg of water at 0(the temp) in a well -insulated container.
If 25000J of energy is supplied to the mixture , the mixture changes to water at 4(the temp)
Find the value
(Give: specific latent heat of fusion of ice = 3.34x10^5J/kg
S.H.C. of water = 4200J/kg)
a:0.37
b:0.44
c:0.49
d:1.44

the ans is B

[ 本帖最後由鍾倩怡於 2006-11-10 11:06 PM 編輯 ]

作者: FreedomJustice 時間: 2006-11-9 04:40 PM 標題: [Physic試題](heat)

concept Test 27(1996)
Which of the following can improve the accuracy of the experiment
(1)Covering the beaker with a lid
(2)Completely immersing the heating coil in liquid
(3)Stirring the liquid throughout the experiment
A(1)only
B(2)only
C(1)&(3)only
D(2)&(3)only

[ 本帖最後由鍾倩怡於 2006-11-10 11:05 PM 編輯 ]

作者: FreedomJustice 時間: 2006-11-10 07:34 PM

No ans me

作者: 鍾倩怡 時間: 2006-11-10 07:37 PM

我讀文科所以唔知

作者: ~樂~ 時間: 2006-11-11 10:33 PM

哥哥仔
你條題目係唔係未打哂上黎呀
都唔知你果個係咩experiment

作者: FreedomJustice 時間: 2006-11-12 04:30 PM

No
I have already打哂出來
is the test for F.5
that 試題only have25% corr(1996)
the ans is B
1)Covering the beaker with a lid
is wrong because sometimes we will test Gas
3)Stirring the liquid throughout the experiment
also wrong we can't also do that so of the liquid we can't Stirring

haha
no corr wor

F.5 lv

作者: FreedomJustice 時間: 2006-11-16 08:07 PM 標題: phy(Heat)F.3-5

(the yaer of 會考)1984
An equal quantity of heat is supplied to each of the following substances and the corresponding rise in the tempature
are recorded.
whuch of the following substances has the samllest specific heat capacity
Substance       Mass(kg)          Rise in temperature
A                      2                      5
B                      2.5                   5
C                      3                      4
D                      5                      3

the ans is D

作者: ~風~ 時間: 2006-11-18 06:14 PM

請post 呢個出黎做乜

作者: FreedomJustice 時間: 2006-12-7 09:48 PM 標題: PHY(Force)

A body can have a zero velocity but also be accelerated.
Qus:This event will happen in which point.
Why
A.Highest point
B:lowest point
C.middle point

作者: lenad 時間: 2006-12-9 12:50 AM

Is the answer B ?

作者: 二五仔 時間: 2006-12-9 03:13 PM

引用:

原帖由 FreedomJustice 於 2006-12-7 09:48 PM 發表
A body can have a zero velocity but also be accelerated.
Qus:This event will happen in which point.
Why
A.Highest point
B:lowest point
C.middle point

force好似係form6嫁wor=.="

作者: FreedomJustice 時間: 2006-12-9 04:23 PM

No wor
I am learning

作者: return_hk 時間: 2006-12-10 01:30 AM

the answer is a
that is highest point

作者: conqueror 時間: 2006-12-10 06:44 PM

I think the answer is A,right?

作者: 野孩子 時間: 2006-12-11 10:21 AM

Of course is A

作者: FreedomJustice 時間: 2006-12-11 06:50 PM

引用:

原帖由 野孩子 於 2006-12-11 10:21 AM 發表
Of course is A

Corr Corr wor
but why ar

作者: 野孩子 時間: 2006-12-12 02:43 PM

引用:

原帖由 FreedomJustice 於 2006-12-11 06:50 PM 發表

Corr Corr wor
but why ar

When an object is changing direction
it has no velocity but it still have acceleration
due to the gravity
the acceleration is 10ms-2

作者: Eraser 時間: 2008-6-28 01:08 PM 標題: 回復 1# 的帖子

[Physic試題](heat)
Concept Test (2001)
A melting ice block of mass 0.05kg is mixed with x kg of water at 0(the temp) in a well -insulated container.
If 25000J of energy is supplied to the mixture , the mixture changes to water at 4(the temp)
Find the value
(Give: specific latent heat of fusion of ice = 3.34x10^5J/kg
S.H.C. of water = 4200J/kg)

Melting ice block = ice at 0 degree
the energy gain, 25000J = (the energy need for changing the 0.05kg ice into 0 degree water + the energy need for increasing 0.05+x kg water from 0 degree to 4 degree)
25000 = 0.05 * 3.34x10^5 + (0.05+x)*4200*4
x=0.44
ANS is B

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