育教濟穏頁三第張七第日八廿月九年戌壬歷夏
市股約紐
揚後跌先
二點十升數指
【股餘萬千七成
WAH KIU YAT PO
吐囘利獲
市股京東
順轉價做
九點八十跌數指 股億三近交成總
報日僑
Jail
五六三、二三。 爲七六八九·四)。新市場指敕跌一·八人而
校上日成交拣三億五千四百萬爲小。 : 市况交投平嬡,全日總成交二億八千萬股,
• 由於日圓尾段鐵約,非金屬、石油股等做微 、藻类股、造船業、新城業及房屋類等做價偏低
夫的逝世,對市場影响不大,而上日華爾街股市 勢上升下,昨日作一個啟風。蘇聯主席布里茲滓 市场消息傳:海外及本地管家在車緻十日股 獸,對市況沒有影响 EN
熱戀上日升二〇、一四,是台下默一八一九一面,
AS+RUZ - +
·前一小時跌四,三
下跌了九點,收市一
·指猋在欸日交易中
改皐段的失地。 杜瀜斯工業隳-均
股市以高價收市收
)在後半小時的交
一組約十一日電】
HARJE ISKORIS
千八百四十一萬股。 成交由上百的一億1千三二十四萬投诚七一
實盤湧梘,投資者可能因而受到鼓舞。 「過去三星期市場人士一直預期貼現率分再降中
·倍,聯邦微獠局在明日下遄初會降低貼現率。 ! 帕西爾公司的性殊說,在車發向下而未就 他說:「未见出現技術調整,挫武者做衰否
.市勢圈摄的受惠者包括主流股及技術股,過
大,因爲一股預彩,道不會導致蘇聯政氣有顯著 ・六分析家聽,市里什紐夫的死近對股市影响不
·分析家對恩市的大幅上升不解。
擁有期畲由十二個月減為六個月所斯發,因對 巴志公司的華治风說,可能因謠傳資產盈利
勝前,資家湧現,令指数收市時升了1〇
1983
中學會考試題預習專欄
物理
CAD
明德出版社盧雄國 提供資料
PHYSICS (8)
H. K. Lo
MILL & DALE PRESS LTD
Auswers to Exercise.
. From the given graph: (a) In stage. V. the
truck takes the Tongest time, it takes 40 seconds, (b) Stage IV and stage V
show that the trück. travel the greatest distance (400m), Stage I and stage. II show that the truck tråvel in uniform speed.
(d)(i) stage IV obtain
the greatest: speed (20 mi
(ii) Since the
(iii).
of the graph”. represents the acceleration,
therefore stage IIT shows, the struck travels with greatest acceleration. §.
is the
its slope.
TV shows truck
obtains the
greatest kinetic
energy for its speed is the greatest in this.
stage.
(e) Total distance
travelled.
total area under graph
the
(10)(30) + (10)(20)
2
(20)(20)
(201(40)
-1300 m
K
As shown in
the angle between the
30 co
arm as the:
vertical is a when
the
in
Let d-density of the
metal rod in
A cross-sectional
area of the rod
in m
might of the 30 cm
orm AC
≈ 4(0,3) (4) (x)
0.3dAg
Weight of the 50 em
art RC
•^d(0, 5·· Ÿ(x) {g}
# 0.50ar
Moment of the weights
of AC and BC about the vertical line through ↑ are equal in Magnitulé, 9.3d3≈(6,1)=0.50$μ(0, (where and fe are
the
centres 0.1
則低器
gravity of the 30 cm
arm and 50 cm arm
espictively)
36 K -
GH
= FACsing
1
•foisine
* BC cose
0.25cose
5(0.15sino
A
=5(0.25¢osu).
5(250). 3(0.15)
2.7778
070 12 Ans:
Let the tension in the string be T. weight o! the block he W, volume of the block he y and the upthrust on the block in water be
(i) In fig.
W
8 N
In fig. (b
T+W
2 +8 10 N
Ans
(8) («) {v}
(ii)8,
re g
density of water 1000 kgu .10-1000{{0}(V)
V-1x10 m3
Ans.
(iii)Let the density
of block A be g
(§, ) (10) (10−3)-8
800 kgm
Relative density of block A
800 1000
Volume of metal
required
M 8000
:京股票.
在持
Total volume of the combined body
·8000
1073 (in
Mass of block A
* 0,8 kg
Total mass of the
combined body:
(M+0.8') kg.
Since the combined body floats in water, with the upper surface Just covered by Whter, therefore the density of combined vody-19: equal to the densi on water
Depth
As shown in the presure at A{P
atmospheric. pressure
mullg
A 760 mmHg Let the pressure be P
(40–10)A
Ans
30A
where A is the cross- sectional area of the tube
Apply Boyles law
But
Ange
iv)Let the upthrust
of block A in
liquid X be Bx. From fig. (c)
Bx
(v)Let the density of
Tiquid X he
B
% (5)(v)
X
2,5 ( )(10)(10-
750 kgm
Relative dene of liquid X
750 1000 75
Let the pass.
required be M
BB
760(404)
Pb(304)
-5040
moilg
pressure at B atmospheric pressure
pressure
due to liquid column
760 mmilg + pressure due to liquid
olumn
re due
-liquid eöl uan
13040
- 760
760
malig
760
(13600) (10) (~~~~~~ ) Nm. On the other hand, pressure due to
quid column
(1200)(10)(h) (13600)(10)(760) (1200)(10)(h)
13600x760.
*** 3x1200
2871.11 m
Depth of the lake
2871110+10cm 2871.11m+0;1m:
-2871.21
5. A force diagram is
constructed as
following:
CE
J 東京十一
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日三十月一十年二八九一籐公平一十七國民華中
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站,市場常息
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裕,買家購意欠
生猪銷市正常
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•1908401+
尾盤成五百七十元。 至七百五十元,普通貨成六百八十元至七百元
高光,昭懿成四百六十元,挑秘最高成七,「十元 頭地生沾一千零五十淵,大沾佔
地大唐十二頭,或五百六十元,中遒六頭,成六
·最高成四百九十元,最低成四百二十五元·本 ,香港市城方面針写大陸人佔二十六西平頭
Water
・W2 B2:
tension
in the
cord
weight of
the copper block
0.089 g
weight of
the iron block Bouyant for force exerted on the copper block
Bouyant force exerted
on the
fron
block Consider the copper block
TW
According to the Archimedes' Principle, Bouyant force = weight of equal volume of liquid displaced, Volume of copper block
mass of copper.block
density of copper. 0.089
:8, 9d where d is the density of water
0.089
8.9d.
0.012
-0.01g
- 0.089g — 0.01g. -0.079g
Similarly, consider the iron block TW
B2
Let m be the mas's
the iron block Volume of the iron block
8d
(1-
mg
0.8718
7.8
8
(2)
By equating(1) and (2)
079g. « 018718mg
生物
0,079.
0.8718
0,0906 kg
(A)
明德出版社梁永華 提供資料
G
test tube
-earthworm
material:
air. Filled
-insulating
screw clip
graph paper
BIOLOGY
Leung
MILL & DALE PUES LTD.
Unit 37
Respi
ation
The Usagram below. shows, an apparatus
at the beginning of an experiment.
(a) Name the apparatus (b) State the purpose
this experi•nt,
(c) What is the use of (1) scre lip (2) insulating
material
(d) What change can
(e)
observed in the. manometer at the end of the experiment? Explain
the observation.. A similar experiment is performed but, the earthworms are replaced by the sage weight of germinating deeds, (1) What change can
be observede
(2) Would a similar
result be observed if oxygen is absent in container B? Give reason for your answer. (f) What is the purpose
of using container A?
11
The following diagram
shows the
beginning of an eriment to investigate the respiration of germinating seeds.
space
jevet
Q
NaOH
soaked
Filter
paper
mercuru
fter 24 hours the
v inside tube bas dropped to level Y while the mercury inside tube B has risen to and stopped at level he (a) has the
mercury in a
*pped to level yo
sub- stance
you would expect to find
(2) Name th
in space X as a result of (a)(1)
(3) How would you
test for the presence of
this substance?
What can be...
observed after your test?.
Why has the
mercury in B
risen to level
(2) What fraction
of gas in tube „B remains in
space Püfter
the experiment?
(c) state four
Jusver
ifferences be turne theresiration demonstrated in A und that ine.
The differential
air thermometer.
(b) To show that heaz
energy is.
買於多量糖賣 價造糖期
跌下續繼 僑
共日全,旺暢投交
。手六十七百八千一成
美ぎ現九上七共投所 否樂
大跌手加手下,此品二
咪,八 交
(24)
produced by the respiring
earthworms.
華僑經濟
(c)(1) To adjust the
air pressure in the
manone ter so as to return the fluid level back to the original position,
(2) It prevents
beat energy exchange.
between the container and the surroundings. (d) The level of ink at side " is: higher than that nt B. The heat energy pródneed by the respiring
earthworms causbo the air inside test-tube Bto expand, as a result, ink is displaced towards
(*)(1) The level of ink
at side is bigher than
that at B.
(2) Similar results
would be observed but the inkat
aide A rises to a lower position. The germinating seeds, still
carries P. but germination but Tess heat. energy is, produced
(f) Container A.
serves as a control 2. (a)(1) A gas produced
during the anaerobic
respiration of the seeds ezerta
a pressure
inside the tube. This causes the mercury to drop to levelY. (2) Carbon dioxide.
A few pellets
of sodium hydroxide are
introduced into the tube. There would be a "rise of the mercury. (b)(1)Since oxygen is
used sup and carbon dioxide produced is
absorbed by the sodium hyroxide soaked filter paper, the gas pressure in the tube id. This leads mercury to
to level. QU
(2).
Respiration in, A
involved
Oxygen is involved.
Respiration in B
Large amount of energy is produced energy is produced Small amount of
End products are
Moxidized Food is incomplete Food is completely
End products are
carbon dioxide and carbon dioxide and
alcohol
water.
Oxygen is not
ly oxidized