1974-12-06 — Page 18

頁二第張五第日三廿月十年寅甲

WAH KIU YAT PO

報日僑華

五期星

雲咸街南華大頂

禮應

禮,成日用佈世 別選出一批名家高建

·浪通各界人士節日送

·本湯集古齋,一

集古齋畫廊供應

大批節日的禮品 精

之路,錦焘中劃,虹山水生册,劉千人作品選集

經名 大宝藏)

*特·刊大鎮北

迎 石貓 篡古 湖中

參章慈

一批册,如上海博

此質具

數:

̇雅音器 此: 做白 圖

量,荒婆

批作

有名董翠乳數百餘獄。

協物院,依系分類模印 「蔉J夙器現魔合舞故宫,件均屬海內外,名收藏||二四 - 內咯豐富。「故宮藏歷代名霋家之精品選二八八六j],五 「」,「慎苑遺銎3 及「册,分名畫五輯,法雩 遥喀期到太子大厦一 歷代名畫家作品通集」,二輯,內容收自隋茧澈。大度參戰,或蕙五1 名實飈版之「故宮藏称盛苑清,爲丘型樁樹日起證明元月十日止, 冰宋 軒 經銷說明。圣審共卅三册,特價發售,由十二月十 由采華軒經銷特價發售 幹幹地名實存歡,

代牧品字法望册

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當師遶上 - 另備函

色彩精印,烩整版英文「共計十八册,內容豐富 公司時均有代否云。

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尙,在品 羊老錄 博

日六月二十年四七九一圈公年三十六國民華中化文育教

者 - 將有一番欣賞的機會

屬然高較員時,

華僑文化

1 黃家明、散華、黃礬如、王機站、黃漢、汪世、黃國偉、黃 吳慈、羅嘉楚、燕梅、鄧飛鴻、鄧永邦、曾馬激仙、徐志題、崔晶盈 徐浩然、獻衆文、冯世康、林健榮、劉柏就、梁曼妮、梁焯林、梁可柱、 5、林高慧、陳克之、陳章、玉蕊、紐一非、延緩、歐中梁、王香圖、 发較過去增加了百分之二十有裔。芳名如下:陳福苦、劉堂、邱永果 各會員也不因負更大的實荷而致湛呆不參加展出;反之,本年度參加的實 一午七時,畫迎參觀,不我已勝。儘管大會堂當局,大幅麗對展覽館咖租, 五中;假座大食堂商座八樓舉行。飛斯一連三天,每天由上午十一時至下 (新社)人現代藝術研究會第十五屆作品年展,將於今日(匦期

在大會堂八樓舉行三天 作品年展今天開始

華人現代藝研會員

奶茶

的糖

優游黃品柱蘭

好石玄通、

、黃女

育教僑

1075

中醫會考專欄

<品作服年會欄代現人整港香)作近油租奥「水山墨水。 特選篇:

之品出,覺展術藝代當之藏珍舘術美物博港香

(作鴻球吳)(止日入長)

12xal 6x3-5 - 57

= 96 x (215)

W. 219 N..

The additional loed requir 219. N.

2. Is a body in in-

物理科(四)·陛永熾

・fixed ats

PHYSICS(4)

'Solutions to the problemon or the

last isnter

1 (a) By Hookera Law,

extension capplied force:

12. en of the rubber band : exi tends by 18-12)cm when load- ed with 9.

The same rubber band will extend (4x6/9) cm when loaded with 6 N

If the band is cut into two equal halves, 6 cm of the band will extend (4 x 3/9) cm when loaded with 6 N.

When two of these Tubber bands. are joined in paraliel to the

load, they share the load equally Each of them is under

the tension of 3d only. Their elongation is then

.(b).

60

cm

Let T (N) be the tension of the ...

a spring, and taking

momente at A, T(5¢oa30°} = |20x3c08306+60x7cs30|

= 20 x 3 + 12x 7

ST

= 4 x 3 + 12 x 7

96 N

under

The Spring elongati

by

the tension of 96 N. When additional load is the spring becomes 6m. Its: alongation is then ̇3m. 'The tension,T is then

addea,

*@° = 96 x 3 = 144 N

The jib makes an

angle. 20 with

vertical.

6.= sin-1

1379

20 74°

•-120N (6+W]N OL = 90°-740160

Taking moments at A again,

4T cot16 60 +-65x7 + Tw

60 x 8 + 7

7w 4x144x3-5, -60x8

香

司機香港

黎鬆最店

配藥員善酒

可樂食

召合

百機:

精時捐链

五手

仟

各混合力

Stable Equilibrium

when elightly die- placed;

its. C.G. (centre of graivty is raised,

and the vertical fall of its weight fails within ite "base.

Unstable Equiliorium when slightly tilted ite C.G. is lowered, and the vertical- fall of its weight falls outside the base.

Neutral Equilibrium when displaced, ite C.G.is neither raised nor lowered, and the vertical-fall er its weight always remains in the same corregu ponding position.

心痛

fixed at 1ts C.G..

Location of C.G. or 8 I solid prism.

1

The prism is sym- metrical with line XY. It's DG, "Lies

on this line.

The shaded portions weighs the same as ̇the: remained: part, Let W be the weight of the prism, W/2

Whe the weight of.

ABC D

The weight of the shaded portion ls. 1/3 of BC,or 2cm, from DC.

C.G. of the portion ABC?D' is 3cm from DC...

The Do

position of 9.G

of the prism is xcm from CD along the line of symmetry...........

Taking moments along the line

The centre of gravity of the prism is 2.5 cm from CD along the line of aymmetry.

With BC as the base, the vertical 'fall of the weight of the prism

is within the bass. The prism is

still in stable equilibrium.

Froblems for this week

1. (a) Explain how the movement of

a simple pendulum illustrates the conservation of energy..

(b) The following observation

were made.in.an experiment ot simple:peridulwn:

0.2 0.4 0.6 0.8 1.0.

length of

pendulum (m)

Time for 50

4:5:163-577-5-90100

oscillation()

Plot a suitable graph and calcu late the value of "g" Trom this graph. (a)

A simple pendulum

is suspended an a board.whichia

hung as shown. The bob is made of iror and swinge

with the

voting point 0. (2):Marc the

dulum Fength or:

the diagram.

(i) frage the pat?

of the bob for one

complete vibration

(iii) Pata atrong magnet below:

position B. How W

lum be affected",

the pendu-

(b) Remove the magnet, While the

bob is: at position A, the pian:

pending thzeed of the boardi

cut so that the board falls free 17. What will happen to the

simple pendulum? Does its oscil- lation be affected?

A:simple

pendulum is

hung on a trolley

as shown, with a peric of vibration of 0.2 s.

The trolley moves down freely (no friction) down the plan of 370. What change is made in the simple pendulum?

3. (a) A ball of mass 0.2 kg hite

a movable trolley with a horizon tal velocity of 20 n/a. After.

hitting, the ball

(d) "drcps down

vertically..}

刪:

(ii) rebounds

horizontal- ly with the

same : speed.

How much momentum does the ball lose? How much momentum does the trolley gain?

余理行公位謝步放的參

VO

的大强行

盖来店名金服神奇人照了千萬苦,

'打有

speed

This is a graph of the momentum of a moving object plotted again- at ita speed= The object acceler ates from u to v. (1) What does A'A represent? (11) What does the area ÛÂ'Â

.represent?

(iii) What' does area A ABB

present? Prove it.

1975

中嶺會考專欄

化學科(四) 陳濃杰

CHEMISTRY:(#4);

SOLUTIONS, POR CHEMISTRY (#3): Multiple Choice Questions

(0) Reaction of steam with hot

barbon

H2O (g) + C = H2 (6) + CO(e). 2. (B) Dieplacement

3. (A)

4. (C) Sodium chloride.

5. (B) Bromine at the anode, lead

at the cathode.

Conventional Questisda

A. 6onfirmatory test on the

different:ions may be performed by

warining the respective samplea

with concentrated sulphuric acid and manganese dioxides.

2017 +Mń0g+4H+ = Mn+++2H20+012个 2Br +no+4H = Mn+

+2H20+12 1

The halogens evolved may be distinguished by their different:

Chlorine is greenish colours. yellow, broning reddish brown, iodine purple in colouration:

Atomic weight of brodine = 80 Atomic weight of silver 7.08. Thus molecular weight of Agör

Mumber of gn. moles in

3.2375 gin. Ager.

3-2375

-189

This is also the number of moles in..2.0517 gn. Kür Tnerefore molecular weigntiof

18x

189

-2.05.17k

179:1

Therefore atomic weight of potassium11901

= 39-1

2. Hydrogen may be prepared by action of, acids on metals, actioi of allbalis con metals, action of water on metals, action of steam: on coke or methano, and electroly sia.

For water. e.acids

(i) Action:

on metale. Hydrogen is usually prepared in the laboratory by action of moder- ately dilute sulphuric acid or hydrochloric acid on granulated

in Kipp's apparatus.

Zinc

Zn + 2HC1 Zn01, + H2↑ The hydrogéasbtained by this method a rather impure due to traces of arsius

1. Chloride. ion can be detested in warsf#91 *mE®aolaiciommitles

solution whea excesa dilute nitric acid and BiIven nitrate aplution are added. A. waité). curdy precipe

of silver chloride, readily

l soluble to amsonias to produced..

Ag + CY = AgC14

In the case of the bromide ion, a pale yellow, curdy precipitate.

·of silver bromide is formedy . sparingly soluble in ammonia.

Ag + Br Agör

For the iodide ion in solution, a curdy yellow precipitate of M

silver Lodtde is obtained, which is insoluble in amonia,:

加却步

: 去有更望

「臺深签動行出出哩遠遠員亦日伊四是新

冰雞

於弱

such as hydrogen chloride (from. hydrochloric acid), or sulphar dioxide aud hydrogen uaphide (from sulphuric acid)

(ii) Action of alkalis on metal Certain. mstals that form anohoteric oxides, such as aluminium, zinc or tin are dissolved by sodium or potassium hydroxide with evolution of nydrogen. However, the action is slow and requires heat. The hydrogen is relatively pure, moisture being the only major impurity.

2A1+2NaOH+2H2O 2NaAIO,

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THE COMM

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簽名

DANIELISIA LANCJI UT HUND KULITE

3H

the action of water oa The reaction of an 'nalgan

iii)

By

metal.

of sodium and mercury with cola water. give a gentle effervescensé: of hydrogen:

2NaHg2+2H+0 = 2NaOU+AHg+HT In Lane's Process, hydrogen. is manufactured by pesaing steam over finely divided iron heated to 550-800°C.

3Fa+ 4H0F034 +42

2

it

Fe 0, is reduced back to iron by passing water as (CO. over it, so that the iron can be used over again.

+ 4 = 3Fe + 4H2 Fe3O4 + 4C0 = 3Fe + 4002

(iv) By the action of steam on cake. Enormous quantitives of hydrogen may be manufactured by passing steam over white hot coke forming water is, this can be,

·converted almost completely into carbon dioxide by adding nore steam and heating at a higher temperature.

0+

Co

(v) By electrolysis, Very:pice hydrogen and oxygen are prepared in the laboratory by electrolysis: of water with the addition of an electrolyteri

·2H, O`= 2H↑

·Cathode

Volume of laboratory.

Anpde

= (2000 x 1000.x. 400) ele = 800,000 litres

Volume of hydrogen at N.T.P. required to fill the laboratory. Cat2000.and 760 moreaBure.

(1atmoaphere)

=

= 800,000 x 23 x 768 litres.

寫

#7445x107 Yitree

Since 1 g molecule of nydrogen

Mumber of n. molecules of

occupied 22.4 litres, at N.T.P.

hydrogen required.

7:45 x 10

As ZH+ FB Fe

Thus weight of iron required

56x3-33 x 10*

= 1,865,000 gr.

烈來

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