1965-03-03 — Page 15

育法 MAR 1965

【真三国

中題預習專欄 物理科

Solution

(十三) 。陸永熾。

By Luk wing Chee:

(a) The specific neat of a substance is defined as the amount of heat required to curse the temperature of unit mes of it by one

The un119 uT speciing neat are the calories/ga./deg.C. and th 6.Th../ib./dég.ľ

The Thetis Capacity of a body in defined as the quantity of best required to ruise its cemperature by one degree

The units are the cal;/degt. and B. Th.U./

deg. N

The water Equivalent or a budy is that msg of, water which; has the same thermal capacity as the body.

Che unit is the "gm. of water" and "Ib, of water".

steam cheat trom whick a (b) The piece of wear is pinced in thermometer protrudes. After some time, the metal attains this.

Meanwhile, a copper temperature shown by the thermometer. calorimeter is weighed, wone vater to added to it, and both are weighed again, The volume of water is enough to immerse Che metal without overflowing. The calorimeter La then thermally insulated as well as possible, and thermometer is placed in it. The metal in removed rapidly from the steam chest and dropped tatottie calorimetery where it cools quickly, giving out its heat. to water. After a time, a steady state is reached when the metal, the water, and the calorimeter are at the same temperature and no further changes take place.

be the initial zeny of the betal

Vater

rise in temp. of water and calorimeter. fall in temp. of the metal.

-be the man of water:

he the water equivalent of the calorimeter.

X be the water equivalent of the metal,

Heat Lost by metal

Beat gained by water and calorimeter-

Since, Heat loat

Heat gained

Therefore X(t =

器油

Precaution taken to ensure a more accurate result:

Transferring the metal to the calorimeter very quickly. ii) animasing heat loss from the onlorimeter by arranging that

ls as far below room temperature as t in above it.

¡31) Minimising heat loss by radiation by polishing the surface

of the calorimeter.

v) keducing the heat Loss by convection by covering the whole,

WAH KIU YAT PO

de) Effect of the liiga specific wat of water on climate.

Owing to its high specific heat the sea wazica uji much more. slowly than the land during the summer, and consequently the wanda fren 'the men have a cooling effect.

During the winter, the sea acts as a vast reservoir of heat) which has been storad up in it during the summer, and the winds blowing from it over the land and made pouparatively warm. For a given latitude, therefore, islands and coastal regions tend to be warmer in winter and cooler in summer than places which are fararland.

Get V be the volume of coal gas used.

deat given out by burning V cu. ft. of coal, gui

480V B Th..

Beat gained by: 30 gallons of water

• 30 x 19 x 1% (22

beat gained by the botter

60 29 1 1812. - 32). you g.

Mese giren aut, by burning, cost gar • Heat gained by, une 003

and its coutent,

UV

- 48000

402 cu.ft.

if koste in a jug lost of heat, the amount of gas used in

Since the cost 14 JUG. peż therm, the cons of heating 147

20 1028 980 110,000

Tas volume of gas used if there is no heat lose ℗ 192 su, f43. Cost of heating 209 cu.ft, of țân • 9.06.

Öving to the fact that the specific heat of water is,'by] definition at the oviaria and the British thermal unit, numeric

rically aquad An unity an bath wystems) it follows shat the specific beat et sur «sther substance in numerickily the pune: whether engranted

Solution

((a) The istent host of fusion of a substance is the quantity at best required to convert unit mass of the substance from the solid 46. the liquid state without changing the temperature. (Unita? eat-/gm, or B.Th.U÷/1b.).

• The fatent beat of vaporisation or a substante 180 the quantitỰ, se mest required to change unit uage of the substance from cas Liquid te vapour state without change of temperature, (Vachan one/gm, or D.ThiU./16,):

香港商業廣播電台 升中指導 算術科第廿二課

播出日期:

第二台:一九六五年三月三日下午五時半至六時 第一台:一九六五年三月六日上午八時半至九時

今欲變利5%

折扣? 贊物的與資或狀項納交畎,常常会累原米更親遞低智 兮之娩的,這種熙原來滅收的計算时戴“折扣”

·割(1)皮大实每件定價為145°C,今日八折出售来

(M)("ANTUM paraffin was in at liquid atace

BUY 11 to melting; partly in liquid state and marvly, in

D: It changes to solid state.

(31) The Incest trat of funion of van determines the Fingiờ"

(*) The Fatent of steam can be obtained by the method of sittures Some water in boiled in w flanki and using a fatuam÷trap" to gagura. pure stess in panned into enter placed inside a čajurimeter, The final temperature of water in observed.

denard is 66:4ined by re-weighing the velorimeter and its contents, and the following seasurements are made for sue calculatinģis

【升中指南 中文科教材

今日在麗的呼聲播出

時間:

上午十時卅分至十一時

下午六時至六時卅分

三十四一二、 成貓酥(九):

無精打采一困徭纸精神、

無欄至寶一珍貴的寶物,其價值無可估計。 無衝不至,非常關心推廣。

北竿5%是过票,求是母子震

瞧行有序一像雁克飛行特作成的行列似的待有秩序 搜索枯腸——用服伤苦层/

日三月三年五六九一腐公年四十五國民中

Let L be the latent heat of stran anes of culorim tai

specific home at calorimeter

Kass of colorimetry

Initial comperatury of water.

temperature of water Temperature of steaia,

Heat lost by taceam

和

Best gained by calorimeter and its contents

bquating (1) and (2).

-

•

To improve the accuracy of the resuit 21

1) Use copper boiler instead of flask,

A screen is placed between the hot boiler and the calorimeter) so as to shield it from direct radiation.

iii). Cover the calorimeter to prevent loss by evaporation, in which}"

case the cover should be included in the weighings,

(a) Let u be the mass of steam coudenaed on the copper, block.

Heat loạt by atean of m2 gm. - 540 cal. Heat gained by the Cu block

540p

90 x 0.1 x (100-15) 705 081

Heat gained by coppes - 765 - 1.424

Ana, Mass of water condensed Es 1,42_ gm3]

to be answered.

1. (5) Distinguish between: evaporation and boiling: absolute humidity and relative humidity; saturated vapour and unsaturated vapour. (b) Define dew point and explain how to measure it for the air of

a rood,

:) Why is dew, more likely to form;

(4) on a clear rather than a cloudy night;

(ii) on grass or sacking rather than on the ground (iii) on a calm night rather than windy one?

(a) What is meant by conduction of heat?'

Describe briefly, with a diagram, to show that "mercury a better conductor ofheat than water

b) What is meant by convection of heat?:

Sketch the apparatus you would use to demonstrate convection

(c) Acebant for sand and sea breezes.

(d) Explain the statement "the mechanical equivalent

4. joules calorie

nt of heat is

(*) an electric drill of outpout hip. 19 used to drill a hob

in a piece. of iron of mans lưù 'gú,

ít từ keo 20 sec. to drill the hole. Assuming that all the heat generated is absorbed}

by the iron, calculate ma riae în temperature, ma

Mechanical equivalent of beat 4.2 joule/cal: specific

heat of ren ■-0,11 ckl./gm./deg/L;; Fh.p.746 waits.)

發表忘餐 -比喻專心一件事連睡覺吃數也不在意了。

撫今追昔——從現在的情景而追念到過去。

·飾如開發 形容射出的箭矢之多好像下带似的, 蔡立道旁一意站在路邊。

榮也好馋 一路新做慈善救濟的研痰。

樂極生舉——正在快樂時候,却發生可悲的贏 樂不願 一作害鄉,不再想念故鄉。 跑

痒...那個獎,那個不對。

輝爐奪目——光彩條構吸引人們的調線。 談天說地——說話沒有一定範圍,無所不談•

,魏功行賞一按照功勞,給以獎賞 •

第年某月————經過不少時間。

搬琴心一膽大心細

精可能止 -在過多的時便要停止,不可過份

(解決一)以八折計算,即当便為足惯20%,

EZAUZE, JA÷149414575

六定價的10%是:1.450×10mm!!在元

《解沃二)定價145元為母款,八花(%)是冥称

貴為子款。

·子母ㄨ軟

名:售價116元,

·心生物街關一批 定價:250元 今期定攬八九色

贵鹅學校,閃穈告数干扰

《湖旗二》惠價150元是每款,普世為子款

八前批割(10%×10%是胶軟

《澥此一) 設定懷為:(100%)

每價12.75元是定價的帮%。

一

餒鋼不過~一指路上行人不撕地來來往往•

勞燕分𡖊一醫喙別離:各居一方

我不一對於問題拿不出解决的方法。 堅毅不拔一做盡有垢力,若不能擋。這 鐐爛奪目—很有光彩,能吸引人們課報。

地

雲海巨

一有財有的大人口

批貨物之成本教干?

貨物变出贴了2%

人數案多好像合成歐衎 用語扼要有力

嘴及教育——使人人都有受教育的機背 ̇喜出望外 一出乎意料之外的歌書。

氣淨生 快樂的氣氛-

分法票•

把成本分为199话是元

答:該批貨物之成水鸡750地

割(3)家美一套;或本300元,如真馆为347,是

多少?(F197

品定價的1%录:12.75元+85m 0.35元 苡龙赏(100%)是:#.15允x100mm 15元

《解铁二) 紫情 12-75元天子款 八五折(15%)天病院

前求定價是母款

(解) 真惯 301元,成為300元,

母歡一字數÷成軟

答;笑復是15元.

12.3585%

删(4)一件貨出原價240元,特價20元,赞折扣之育

光大——發揮傳稿得更廣大。

自蟹——自己不停的低不說話 *

不休————不停地多說話

小思 喙不忘其大的意思。 可比擬——沒有其性可以比得上油

一個起難子連泊黑免快跑 •

•務疲力竭——筋骨捷卷,精力竭費

德霸失第——担因和得期。......

是正跟幾一一套由-

足,包襲驻法。

要不饶人——合乎正義的事情趕快要不要人之情。 萬水千山一比喻相關進

真世紀養一世世代代被餘需祺範來體。

路不抬道一別人還下東西也無人拿法,發治安良

雖與終身——起了自己一生。

·蜀犬吠日————比啡少見多怪*

霨風襲集-形容往來的人案多

當然不是一好高選號,不可退癭、

如破竹一毫無阻擋,要贏直造,軍事勝利之速 餑博變惑——像持一般的情調,據一般的意境。 感蟹為平——無限感康。

若發不絕—一個水疏似的溫度不斷,確認數步。

一切切實實的去做。

意爛緊然一不感到興趣,

賴漢菌一家中財窿散曲

愛不需學一所愛的東西拿起捨不得放下。

所不 一听她到的錢從來沒有到過的

£16!%F:"140% #10x=0.34%%

答:樂率是29%..

· 420970 ÷ 7.47 — 85k)

奥(件)恤衫一样,成為出

衫淰⁂儣▽

將起輕一农渹壓棄,有决 軍領軍力一大家計觀,大家努力

運用自如——很熟練可望健應用

《解读二)原惻140元岳母默,传侯204元寿子款

海

象跳化極大

所求為請款 ̇

翔了45%,建设了:6

?勢均力敵一雙

蹠歡一子數÷母数

慎跅裒情~

你呢)x100%

陳軍辉的奔跑,

配置5X100/

練習配十一

一無給任梛性亦不推辭。

分室

南紡背物一批,在便得500元,今以雙北拆出售,同便宜。 CASUTEI

梅雅安一批;原仅售2068元;→以七五折八,使况

單使的丸計去,同时赚若干示。

NUMBERAT OIKE,=.18)

称響四十二

(幻*手錶一失,賺X用卡1502,情黯30%香

147 1460.x,33.)

心迷楼市一差,成本为564,若使赚了

******** ***?

{0} #H÷30,8.5775MM, M339%,RMK. (4)某人購入墨水幣一枚,價315元口便士,

想貨品,求量将的百分率?(ight).

̇練習三十九答案

-澤過遙遠的洋到外地

一聚集在一起.

茶期劑

一不急不忙的油氣

一打了關仗,以食物或金錢量賬

瓿就 一小心該恨,惟若鏕誤、 蒼茫茶略——一片茫茫,不以跟• 客廳而田一淚流了出來。......... 輕暴安勖——没有周詳計劃,轻率燈之 體人不應一集於女人,不會厭館 變真求~ -做真漂求實際適當•

-熟與安詳 。

·雜妙惟骨——很相¤

̇糖瓜得瓜一有其因必有其果。

將附和一架口冥聖地贊成

體會用歐~很稀少,一看就可以數得出來,

精神萎‱......精神頭長不振作。

與世長辭一部新舞的意思

精求清一已經很好,還進而更好些•

02 43 61% Di715% 855187 (5) 528,

練科四十答案

微然零一印數不清楚也不完整

新船生巧一工作熱辦了就會做得更好•

07 BILA (2) 4868; (5) 4% (43 5745 (8) 18%

執中名利於名利看得很重

辣兼魄——驗恐非常,魂魄也都味離了身體。

養生之道~ 一保害身體以嘗的方法*

-陷入錯誤以数赠落。

·適者生存—

-能適應環境的中能生存於世界

優銀獎 價錢便宜,物品英註。 窮鄉僻谧一餐得偏辧的鄉村地方。

杯决

但我不能决定。 感到不平商情緒激動

全世憎的情

卖食方面力求節嫩省下多

一樣烈得無法阻擋

我有其樂,其實本願並不高。

戰戰就第一:懼的機子。

周蹤購長弦一條理分明的意思用以形容做喜特·

WBRAY

圖占業期一用作表推他人獨占然一位 •

三至三十三

5溫擇適當的字,纖入空格內,使成一有意義的瓦器‡

1. 典藏()拿

2.喜氣洋(

B. BERDA

4. 口亩()

5. (OR

6

(到底

7. COMBA

8。當頭()喁

19. 15 DECO

10大不服()

鴻成奈

(11. BBC. ).

12.先例()

13. 老()持您

(14)

15. 栩除(

16.) M

17.

調無

18、()山的水

$19.

€ OMSE

20. 沈解13雅

(二)將下列乙值內適當的量詞配在甲組內,只需將帶與上就行。

甲組

1.BLE

11.四藏(2)

11.弥海

ZADC 3天鹅 4.撚嬲(

...).

2.洋洋

12.火光(

12.入:

13.茶盤(

13.15.4.

5.忠心(

16.18% (...)

6.沉沉

14.H( 15. C 16•精神(

14.赳赳

15.W

16.粥蝦

7.1).

7.勃勃

17.來勢(

17.熊辭

18.大名()

18.彬彬

9. C...

9.K

19.李皓( )

19.茫茫

10. MMC).

10.恢侠

20.(

20.融欣

COR

6.肚()()

(三)用搓當的半配在空格內,使成一有意要的詞語:

#CDC >#

3. CXCR

4BC9C

5, ()();

(2

9. M 10.

(四)先在錯別字下餐——保,再把正宇寫在空格內:

1、浪廢(

2. 油酸)

3。 遺忘(、)

4. B

5.撥概(

杉加〔

7. EFC

B. IF C

9. 相量(

10. 單輯(-)

(五)將下列每句的字向成通顺配句:

1. 精業嬉麵於於荒

2.寫不之在酒醉(

3. 小勿善爲精品

4. 儒批日勞心

5. 强有中中强自

6. 一可換誤再不:

7.嘗釀卷里為萬行路(

8.内四期之海皆录(

10.天下散筵無之不席(

內

附糠習三十二答案 2.

11. *)

12. (

13. 桃亡(

14. D

15. WEC 16. 微漫( 17.分拆 18.包術(...)

19. BAC

20.C

(一)1.裝

10.0:

(二)1.物異

9.-10.00

(五)您

4. 3. *.

2.鋶逸

3.部落:4癌大 2. 3. 4748

3.匆匆忙忙地 10.

3.

4.72

5.

5.危險

B:怒怒

8.鄉村

5.酸對

4.悩悄悄地

您

5،剛纔

16.0

6.16

9:00 10.3

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