經馬日三十月十
何更不必細安,筆者以6比君證值得大書吃 一級。「青城」僅略有起色,配此君
馬安斯在馬迷心目中地位有限,轻技如燊一竿。但一般而會只能說必備可交回水 準,比起馬素爾、馬佳善、唐敏生等•明顯
| 費+只有一場,就是上季初雇「最佳寶」, 盤場走位可網神來之筆,但此君行志甚鮮
場埸能騎回其本身水準,
明,故筆者亦不會將芋,水平不高實在無 應冷靜一下研究才可抑場也。
而捧成大熱,落既可說非戰之罪。今後可能 仍有造類米夠本錢之馬投其胯下,屆時各位
但又撾番落去,但入直路 後佢又輕 無力活語。「人據」出们並未脫節,
·笨嘅人,妮匹馬都使去追佢嘅,末段 「火紅火綠」鬥放,湯寶在亦唔似时
·都冇,「永寶」竟用放乾戰術,去同
-戴迫番上嚟,幾乎過『自由萬里」,呢匹馬四也。
30
(19)
育教 日三十月十年未辛
1992 中學會考預習專欄 明鴻出版社
MILL & DALE PRESS
Physics (7)
Exercise 7: Change of state
Where necessary, take
G. Y. Mak
Specific heat capacity of water
= 4200JKg-1K-1
Specific latent heat of fusion of ice
3.36x105Jkg-
Specific. latent. heat of vaporization of watervers
*2.268 x 10 63kg-1
Specific heat capacity of ice
21003kg-1k~1
1. Calculate the energy required to change 0.2 kg of ice at -10°C to steam. at 100°C.
2. A. 180W electric heater is used to. heat 0.4 kg of a liquid-X from room. temperature in a well insulated container. The temperature of the Jiquid against time. of 'heating is platted as shown in figure t below..
(a) What is the room temperature?
(b) What is the boiling point of
liquid X?
(c) What 13: the specific heat
capacity:of liquid x?
(d) What is the specific latent heat of 'vaporization of liquid X?
3. A. vessel of mass.0.42kg. contains 0.8 kg of water.at 20°C. The vessel is made of alloy of specific heat
capacity . xūkg-1K-1 If 0.3 kg of
-ice at goc is added to the water and 0.07 kg of ice remains unmelted. Asume no heat loss to surroundings. (a) find the value of x
(b) haw much steam at 100°C must then be blown into the mixture to raise the temperature to -20°C.
4. Figure 2 shows the apparatus which.
may be used to measure the specific latent heat. of vaporization: of water.
edactronic top-pan. balance
kliowatt
hour mater
heater
socket
...
報日僑
(a) Draw a simple diagram to show how the apparatus can be set up. far the experiment..
(b) The following are readings taken
in the experiment.
Mass of water at the beginning = 1.5 kg...
Mass of water after the disk in the kilowatt hour meter rotated. 84 revolutions = 1.3 kg.
kwh meter calibration = 600 rev/kwh.
(i). find the specific Tatent.
heat of vaporization of water. (ii) suggest two main sources of. error why the result is different from the accepted value.
Solutions to Exercise 7
to
1. Energy, required:
E
beaker of
boiling wate
raise
一期星日八十月一十(一九九一年十八國民華中
(c) Let P Power supplied to liquid. X by heater.
2604000m = 1,26000
m = 0.04839
· (Ans.)"
at = time interval
AE
Pot
(where 49 = rise in temperature)
Pot = mss
出
必
X
(slope of the graph)
180 9x60
0.4.
(84-24)
(Ans.)
'4050Jkg-1K-1
(d) Specific Jatent heat of
vaporization
the
= (180) (3x60)
324003kg
temperature of ice from -10°C to -0°C.
(0.2)(2100)(10) =4200DP
Energy required to change ice into water at 0°C
=(0.2)(3.36×105)
- 672003-
Energy required to raise temperature
of water from O°C to 100°C
(0.2)(4200)(100-0)
840003
Energy req
required to change: water
steam at:1006:
(0.2)(2268000)
.4536003
The total required energy:
= 6090003
2.(a) From the graph,
Room temperature-
(b) Boiling point of liquid X
84°C.
Answers
English Language (7)
1992 中學會考預習專欄,
1. D 2. K 3. E
6. H 7. M.
11. A. 12. By
14.J
明運出版社:
MILL & DALE PRESS
Exercise (A)
QUESTION TAGS
Choose the question tag from Column 1t which best completes the sentences in Column 1. Write the letter of the question tag in the spaces provided." Eachi tag in Column I can be used only ONCE. The first one has been done for you as an.example.
Column I
EX. You are late this morning
1.Let's go on a picnic,
2.Pass the sugar, please,
3.What lovely girls,
4.Everything goes on fine."
5.Nobody knows the answer, 6.The so}diers'd rather die than
: surrender,
7.They had hardly "studied;
8.We never dare to tell lies,
9.They could get the first if they tired, 10,Henry and Judy used to live in the Alps, 11. They usually have their lunch together, 12. The teacher. commands the students, "stop
talking, "....
13.They have some suggestion to make,
14.They 'd better study their books..
15.They should have asked my permission,
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B.Won't you?
C.doesn't it?
D.shall, we?
E.aren't they?
Jangues F.aren't you?
G.do we?
H. wouldn't (they?
I hadn't they?
.do they?
couldn't they? Whad they?
N.sboston't they?. 0.haven't
P.didn't the
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Exercise '(a)
(Ans.)
In each of the following' questions, tacide whether one of the four choices
·would: most suitably. complete the questions inserted in the place.
marked
1.Jane said that she wouldn't come to
the party,
A did she
B. didn't she
C. would she.
D. wouldn't she.
2.1 am very good st
A.jsn't it:
B. don't I
C. aren't I
D. haven't l
3.What a nice day,
A. isn't it
B. doesn't it
C won't it
D. is it
4.Let's not invite. Gertrude to the.
-party,......?
A. shall we
B. shan't we
C. will she
D. won't she
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(Ans.).
3. (a) Mass of ice melted= 0.3 -0.07
`=0.23kg
Energy given out by vessel. and its: contents
(0,42)(x)(20-0)+(0.8)(4200).
8.4x+67200.
-(20-0)
-8.4x + 67200 0.23 x 336000
1200
{Ans.}
(b) Let m kg of steam are required.
Energy evolved by steam
(226800){}+(m){4200)(100-20)
=-2604000
Energy absorbed by vessel and its contents
= (0.07)(336000)+(0.42)(1200)
(20-0)+(0.8+0.3)(4200) (20-0)
= 1260003
With each other,
A. oughtn't you.
B."oughtn't I
C. ought. we
D. oughtn't. we.
6.John's got a lot of good friends,
A doesn't he
B. isn
he
C. hasn't he
7. You need the dictionary now,
A. do you
B. don't you
C. need you
D. needn't you
8.1 have to do
A. have I.
B. haven't I
C.don't T
D. do I
9.David dared
examination,
A. dares he
8. daren't he
C. did he
D. didn't he
你
10.Nothing is difficult you try,
A. is it
B. isn't it.
C. do you
D. don't you
A. W. Sh
8. isn't she
does she
-4, (a)
(b) (1) Mass of water at 100°C
boiled away:
1.5-1.3
= 0.2 kg
Energy: transfered.
during
per revolution of the disk
1000 x 3500
:60003
600
Total: energy suppited
84 x 6000
-5040000
Specific Tatent heat of.
vaporization of water
504000
0.2
2520000
= 2.52x106 Jkg-1
(Ans...).
(ii) The main sources of ceror
aren
1. steam condenses on the 'top,heater, drops back `into the beaker:
'
2. boiling is vigorous and
a few drop of water may jump.out of the beaker:
12.Mary has a lot of housework to do,
....?
A. has she
B..hasn't she
C. does she
D. doesn't she
13.None of us know: Italian,
A. do we:
B. don't we
C. is it
D. isn't it
14. Father. I wish to go to that show,
A. wish I
B. Would I
C. may.1.
0. have I
15.Mrs.
Wong hasn't proposal yet.
A does she..
B.doesn't she
Chas she
Dhasn't she
agreed
to
Dur
16.You needn't do all the work alone,
.......?
A. need you.
B. needn't you
C. do you
D. don't you
11.Winniesel 30年
arrives on
time,
Answers
18
2. C
3. A.
6. C
7. B
8. B
4. A
9.D
5.D
10. A
11. C
12. D
13.A.
14. C 15. C
16.A
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