頁四第張六第:日九廿月九年寅丙歷夏 WAH KIU YAT PO
1987中學會考 試題預習專欄
物理(六)
Revision
for
Exercises
Cert. Exam, (1987)
FEYSICS' (6)
HILL & DALE PRESS LTD,
2.2 Heating and Internal
energy
1. The total internal
energy of an object
kinetic energy and potential energy of all the molecules in a body
Heating i話
process in which: internal energy is : transferred from une body to another as the result of a difference in temperature.
Thus the higher the temperature, the nöre internal energy, the object processes and the more total energy
(kinetic and potential. energy) its molecules bave te
It is our experience that sometimes bodies get hotter without heating. For exauple when a block of iron is hammered by a hammer, the block gets hofter. This is simply explained by the fact that work is done on the block and the internal energy of the blockt increases. Thus, both heating and work are processes in which energy transfera occur. But itä is important to see that the former may not involve
in change in temperature. (For example, when a block on a smooth borizontal table isti pushed by a horizontal force, the kinetic energy of the black increuses
bot tue, temperature of
the block does not
incredat.)
2.3.Heat capacity and specific heat capacity
The liest capacity of a substance is the energy transferred by heating in order to raise the temperature of the
substance by one degree Celsius.
Thus:
Let E-Energy trans-
ferred by heating
∵AT=chang
temperature Cheat capacity
of the
substance
E-CAT
Example: If 150 KJ of energy is transferred, by heating, to a block of iran whose original temperature 10°C to 30°c.
Find:
(a) the heat copacity of the fron bluck...
(b) the additional energY (required to raise the
temperature of the.. black to 60°C.
-E=150000' AT=30-10-20°C [150900-c(20)
•C=7500 J/c
(b) Let E-additional.
energy
required
•=C(60-30)
=(7500)(30):
-225000. J
The specific
heat capacity of a substance is the energy transferred by heating in order to raise the temperature of 1 kg of the substance through 1
Thas:
Let E-Energy trans-
ferred by heating
ATmohange in
Example:
temperature
n-mass of the substance
c-specific heat
·capacity of the substance
E-CAT
A copper ball of mass
2 kg is placed in a large tank of hot water and left until it has. attained the temperature of the tank of water. It
is then transferred
quickly
to a copper
報日橋
calorimeter of masa.
0,02 kg containing
0.198 kg. of water at 12°C.
If the temperature of the water risea to 52°C. Find the temperature of the large tank of batt water. Given that: specific beat capacity or copper is 420, JkgK and that specific heat capacity of water is 4200 J♬ kg K.
Let the temperature of the tank of hot water be TCU
Reat energy released by the copper ball ~(2)(420) (r−32)
Heat energy gaided by water and copper calorimeter
(0.02x42040/198 x3200)(32-12) 16800 J. (4)(420)(T-32)
16800
T-32=20
T=52
2.4 Latent heat
It is found that when most of the substances change their
states, energy is absorbed or given out without any⠀⠀ change in temperature. It seems energy is hidden' so that the temperature. remains unchanged during changing state. This
thidden energy is called latent heat.
The specific latent 好意思 substant
the energy transferred by
heating to change the
state of 1 kg of the substance without say temperature change.
Thus
Let E-Energy trans-
ferred
Example;
mass of the subatance 1-specifie
latent of the auyataice,
A closed copper vessel
of mass 20 kg contains 2 kg of vater and 3 kg of ice at 0°c. If steem at 100 C
is passed into the vessel at the rate 0,01 kg. per second, find the tide required to raise the whole systemth 100c. Given specific heat:
capacities of water and
copper are 4200 J kg.
and: 420 JkgK
respectively; spe: latent heat "of vaporization of water.
and
specific latent beat fusion of ice is
336 kJ kg *:
Heat: gained by coppe Vessel
-(20)(420)(400–0). 1840 kJ
Heat required for 3 kg of ice at 0°C change into vater =(3)(336 kg) -1008 kJ
Beat required for totally 2+3-5 kg of water to raiae its temperature from 07
to 100°c is (5)(4200)(100-0)
-2100kJ:
Heat energy requi: -840-1008+2100- -3948 KJES
Let time required be
t seconds.
·六期星
mass of steam required
=(0.01)+
[(0.01) ►] 2268–3948
t=174.18
經濟(六)
Revision Exercises
for
Cert. Exam. (1987)
ECONOMICS (6),
MILL & DALE PRESS LTT
Factors of production
Returns to factors of production.
Land, capital, labour and entre- preneurship are the productive resources available to produce commodities. Payments are made to the owners. of the factor: input La return for the services rendered their factor of production. These amount of payments are called factor
·íneome's in economics, Factor income refers
to the payment which
日 一月 十年六八九一曆公年五十七國民華中 朝花育教
producers for the caployment of each unit of factor service. The factor/ incomes consist of four elements:
A. Rent is the payment
to land. X
b. Wages are Lhe
Payment to labour Interest is the payment. to capi tal Di Profit is the payment to entrepreneur,
A. Heat
To the payment, rent refers te pri če paid per unit of fime for the services of- some durable goods such as the rent "of· á car, a flat, a television set, etc.; Under the alone condition, the payment. ja called commerical rent
- To the economist; rent.refers to the payment for tie productive factor. which is fixed in supply. It is because rent is the payment. to land in production, Land is not only defined. sa the production site but it is also regarded" as the natura) · resources involved in,produe
tion which is fixed. in supply...
B. Wages:
Wages are the payment paid by the firm to the skilled or unskilled, physical or mental labour for the effort they have made in production. - Time rate means
that the workers are "paid according to the
period of time they work for producing goods or services.
Piece rate means that the workers are paid according to the amount of goods and services they have produced.
C. Interest:
-Interest refers to the payment paid by the producer for the use of capital and it is the rate of return un the capital. invested.
money capital may be
Borroved from, money g Tenders, interest is also regarded as the payment by a borrower for the use of a sum of money for a fixed period of time.
If the payment is completely for the
called pure interest. Usually, interest: includes alsó- the payment for the risk involved in
D. Profit
Profit refers to the income accures to entrepreneur. It is the reward given for the performance of the managerial ski and the organization of the firm. In addition, profit also refers to the reward to risk bearing and business decisión making in an banufactoring unit..
Since entrepreneur 18 the
one 'wh0. organizes the other three factors of production. anl supplies the capital of the firm, profit is the amount that remains after the rewards to all other factors of production.
II. Determination of rent, wages, interest and profit. In market economy, the: price of productive factors are determined in the factor markets through. price mechanism. In other words, the factor incomes, just like the prices of. other commodities, are determined by the interaction between demand:and supply of
the factors!
The market demand of, a factor of production- for. example, the market. demand of capitul. is the aggregation of the demand curves of thie individual firms.
The demand for factor of production in an individual firm will depand
upon:
the physical
productivity of .the facto
If the produc- tivity of the factor input is improved. The demand for the factor.would he increased, For instance, the productivity of a machinery can be improved through technical progress or managerial know. bows.
the price of the product which the fira is producing
The demand for factor input would be increased resulting from the. rise of the price of the goods which is manufacturing. the prices of other factor scrvices employed by the
fira
The firm may employ several variable factors. in abort run production. Factor input are mobile so that the price ot other factors can influence the price of the factor to some extent.
The supply
For the factor means the amount which is Coffered as the reward
is varied. Because factors of pruduction would be attracted
from other industries. and occupation, for example, the supply of work force, we should expect a higher price to expand supply:
For the same token, more aupply of land would be expected due to rise of rent, and profit is the incen- ive which stimulate the entrepreneur to make more effort in production,
c. The prices of factors of production such us rent, wages, interest and profit are. determined by the interaction of the market demand curve and. the market. sunply curve of the factors: of productio shown in the follow
ing diagram.
對生活熱愛的一面,從十分平常的景物中 意盎然,使人感到春天的可愛,這也是簽家 上關係有關。
現出內心世界。
說筆腿贱了,而是說別以為恐只能寫高雅的 一:,第一句:「堅從今贱作纘唯一。並不是一
外滙券易發難收 京甫
* 某些進口笈之類規定 假若取清外誰分後 - 而
在許以港幣代替,根本
對外匯收益店然是有好
觀浪客
·深頭兩歪
是
談宙論難之四八四
題識加强了畫的感染力
雙魚
懷舊
珠
也很有明星風範。
,偶然啖熱鍋也會看看。 看 到二十多歲的小生張瑛,園市,有她沒府講吧,那年代,人們 髦说台早晚都有霽語長片放映,全提手繪遺跡,可翻盤水崦力。
以些全
是但有
, 但佈景就夠化學了,湖山花草:
有些佈景是熟口熟面的,一個佈景
心入肺。
上感情豐富的觀。
感動,淚如雨下 脚三㚲水遠是巴巴的包租婆,芳
·白燕永遠是良家婦女的典範, 衆,說不定大受 ,那更是達到
一般使有了新的生命。
如深的宮意,也使人體會不深。 將,只望酒帶小號,頓忘闢去。」,
一要是沒有雋永的噩識,畫雖寫得好,沒有深 :「江漼野人家,土涸頭哥這螳花,春來一發殿焉沓法的結合,是中國畫才有的獨特風 片紫雲,掩映一枝紅杏,將者到此,逸箕遄格,可蟒傲的有别於世界藝壇獨樹一鐵也。 這本是籌常景色,為了他的筆下,春 世與工具有關,也與做的構成,不與書法活
* 這一幅土牆蝶花,是寫一些野生的蝴蜴,映一枝紅杏在色調上,进一枝客到枝顛的紅 可是莊周夢裏身,柴雲高捲隔花斑,奪米本 中國聲,如畫面已有足夠的感染力。可不必, 此固,幾日而淋劉有缺,媒花和土一齊飛 一畫i讀者能領會到一些什麽呢,或說,人 花長在濶頭上,是在郊行時看到的景物而已,杏是那末突出,濃淡墨的土牆,紫的蝶花,
【談過了鄭板橋的;荆棘漵蘭」,再談, 東西,十個堆這般平凡東西在人們眼中是卓 但是這風格,西洋畫除了署名之外沒有别的, 朱莉住,盡長將頭去趟入。」其後還題上一題何。說若是忽略了,中國畫自唐朱以来已,此何物也新藝術品 當他遞:「墨從今談作當堆,院字者光在力能末邊。假如沒有吕楠姆爾郝師週句,出入與芽就不能苦命人......。 家在春光中,讀者也在春光中陶醉了,感染 ,就是那末簡單。但加上了他雋永的顯句, 其中有一枝紅杏,開目視之,此景多美,畫
·兩人有代表性的作品,而顯識亦並皆佳妙, 後幾句又何必對春光歌頌。要「盡長襪頭去,但分吃香。,,,,,,, 「李園的「士稱紫花劉」,還前畫,都是婚手,襄的東西也一樣可寫。要是他還說上腦,他將目秀,是幾年頭的正印小生,十 要求不高,有别於今天的觀案,娠 紙,雙花是紫色的。故說一片整盤,其中義,七情上面,而關德興就總是忠得入、「感兩得。若瑾||| 野外小眾,在畫家筆下,癸為得容光滿對頭。石坚扮演的角色,永遠好得,舊的人的口味, 先先,還有石堅和關德興,水是死娩出;而且,那時候的明星就是 明星,祝材實料,也適合現在愛物
;大多都是演得認眞而又落力,·導的「目的」
對正港口有如守衛
芝茶
:外逸券問題可謂一的外匯收益,國家日後,一個國家兩種帶制,幣,再無人說要收外匯
合却券
讓的
下齿有继。
來定失幣但無
真的不國 流取人都向顧
是會家通消 說香港,
| 取行 齪 於匯 收你兜區
海。,理勝外耠 售的
外於 退 不後 匯港物小
B政府負責人公開宣佈發展的過程, 幣制方面的事,怎邀不站在國家經濟 ,外匯分涉及的是國家 過一定作用, 都不算數。有人批評誌,段時期中也起 穿問題,却是說來說去,它在過去一 人數」可是現在對這外匯下的特殊產物 ,崇對的是「說了就算也是特定環境 是決定,却是那樣反來發難收。平心 【大方:怎麼沒接一個重,似乎又是易 上篷去的?過去中國說話而論,外薩券
阿來說去,已經不止一包 都是要先解決的貨物供應較爲寬裕,外 人出來否認,這樣的職業與企業的關係,這些是有目共睹。随着内地
。這件事似乎总是貽笑 外匯券目前的情形 滙棼購物的特森效用地
但「不旋踵」,幸閶個 外匯棼建立的經濟關係 取消外匯分是遲早問題,有失國家會嚴。
心是不旋踵,又有另外的,包括部門與中央、進。外鹰券產生的流整型 辦法肯定不會費行。於?人民幣單一幣制,却 ,並且起宁德日期,按什奈良雄,而原來憑看當然也要穿大,因此權證,還直等後,用什麼來替代
以往用外匯】
的廣泛流通。
幣在某些地區
中間還在於港
·逐漸消失,进
如何計算外商投資企業。一些產品供應最不多,去了它的地位。因此, 多問題需待解決,譬如一種可藉以帶式的手段 長價,外匯分好像已失 不取消了,據說是有很國家外匯收入方面,是以購買的,則以人民幣 活 · 外匯分好像又暫時去一段期間,外匯好在,港幣計算。不用港幣可 *都好像很有分别的。?品方面,外匯分倒是人在許多賓館的購物商場 透露,而每個人的說法 購入外國先進技術及商地位。現在往內地旅行, ,却通過溫低或那 特别是吸引外商投資, 根本就取代了外匯券的 按照最近有關的淡 良幣的一種補-
,在過,貨物的讓價,大都是 這是君外國記者報道知道的。
尤其是特區•
幣在某些城市|
!!」
們當
去時
品
生活大前提,给夫人
豆子選舉 持有外國記者的陕北,於引海也
辦
·海點飛翔白波起价
不過要知道,這個行意,意不到這個階段,尤其是, 一人選舉」問題,有的奉,不「民主」。蓋有的理論家以 ,現由末路 冯人民教育水平不夠,選舉不易進 中共在未得政櫛之,還在抗戰,選舉難以實現。 上行,即所謂一副政時期」,以此凖车及遥那聲响耳轉 高施這機宣傳,可以表示有「民主,輪中槍問厭掌航發起 王」,同時可以攻擊國民黨區不辦選下,好比執筆人自嘲爬格子動物 123 生活是大前提。
還備行
者
字我方,邀謂1
知香一們面選
而歌者毙唱離别曲於事無補
「奶奶,十大爺......每人發一艘,告高一貼。香港有人提直接選舉, 何如果讚成誰做村長,就把豆子投 不夠,就可以搬當年陜北的一套地。 「說他們。那一個矮子是代表案,你,如遭到反對,又如說市民知券程度,縱使前有山路 開敷時就點豆子,以多者當選,用豆子來選舉又如何,遂此批供. 生活是大前提。 仍然盡力跨步,爲的
進場的三條,八婢,七姑,九一年前的陕北老奶奶,老徭爺,大概可,何嘗不是仍然等待明天 你、我
埋怨百事棘手却雞
新戆舊恨徒慧倩緒低落
子使就反!
來不可到
點頭
小飯
榮大
開嗎改:
半
筋十分益活,最能配合 通行用傘了。
但沿著有遮蓋的行人道 後期有絲做的 等應時商態出現。,之後;又有了紙傘, 走了很久都不見有此布帛做的伞。發明了紙 此地的小商販,腦 屈命。如今是全世界都
一
過去,而動手殺
榛
酒
“那就更是欲蓋彌
【七歲,背著行李-披所兢的去到山中寨子一
族村寨-那時,她才十
眞面貌,戲一開始女
·傣寨與原始森林的許多
「香祚祭」拍生了
世事的是女孩子在街道上排除照鏡子,要收一毛錢
讀到一篇討論香港學生語文水準的文 要
章,不禁為之傷心一個問題樊老,就如
夷,老人一樣,越來越覺得他的頑固,雖以了 過
水隼香港學生語文水準低落原因很多,奥
也不容易,加上大部分原因不是一朝一 進夕可以解决,這樣似乎給我們足夠的借口。結果問題 只寫在稿紙上,活在報紙不被重視的一角內,無人理
問題要一下子得到解决實在不易,但替問題打下 解決的基礎却不一定如何困難;問題在有關方面的態 高度如同。只要打開中學的中文科課本,不難明白問題。
的所在一踝程内-
滿水準並不高的作品,追些作品
半根本不能起範文的作用。至於引起學生的興趣,進而
知提高他们的水平,似乎只能是少1課程編制委會
的鑒賞和選擇能力,令人不禁起了懷疑!
投這個機了。」
的小販必定很多。但量 創造觀念却仍如往 到時候,雨來得太過突然就是說:用時可以推 ;即使是最會搶時機做,不用是可以合攏。
視頻頻下雨的季節,實傘 花式繁多,那最基本的 《國家的需要。例如,在不管如今的幽如何 生意的小販,也來不及其時,很多用品,四東集 也想來,以這種物体,不用時,劉若棧 語文水準的提高,半知
記 ,都會科理安德。」,
又點進行?傻妹仔叫敎授議嗽財外,換涼之醫生繞以老而好色是睿徵, 萬台艺人,是如可撥结?教授話佢亦民國任,笑而去,而另一對夫姊六代下,一度大小 我為榮,開通。而房時點樣攬掂?除咗新郎哥係優仟 未止,是何道理?醫生奇之一, 檢在後,發現新郎包皮過。末年,我國最著名的太 ,剪錯之後,民六七年間大糍上城市中人已 說新婚之夜,但痛到谠眼淚,乃鳴金收兵器,至今仍奇痛國人發明的,阜在春秋
·男女·互相於房中 係人答答者,件事,將生乃以性知識解說一番,此老太婆聽到一頭霧水,幸而不用時可以收成一根根 長,當晚操之過急,以致有所損傷而發災。醫生鳌其洗滌工師傅魯班,因爲信格
與我行埋多者二三大·亦一次·我貼心他出咗乜毛病!」造了。用時摔得人大, ╱據說,伞是我們中
被红赤行法」,十九係梳起唔嫁,玆陈艾唔落範者。,去包皮爲佳,至此新娘羞答筹+新郎多謝而過。
問者中, 有六旬老翁 教授又話,在去前的妻子,為丈夫若想, 雪天,使狼狽了。段班,收
“貝莎
14黃老格問用過去事 性封閉含羞細訴
,此種唔落家女人,
化肥發很小的物件。
古··有另一雄家啜之,就會極濟情况,立刻有了轉變。而 「九七」之後, 蔣經奏了一段轉得短暫的壓力後,
月关落地。八三,然而,他們在外地的投資,却未 找写後路,以作 棄了本港的一部份投資。結果,本 年時紛紛外出,,能收取預期的效果,反之,出裙放 大局已定,但些大機構離開,到外地去投資
地的人,亦紛紛 他們在外地的投資,却害指手,這
前早有準備,着一套緊身內密齒還計,你用所刀剪都無爾說話:「我年龄大,她輕我心中是到無法滿足她,並且面上面標上獸皮,弄成個數十年,他們在三、四年前離去後,有的投資調回本港,集中在本港發 高腰 將機會雙手拱讓 太子森
你拜拜英. 從入手。剪開一度,剪唔開第二度。三朝之後佢返嬌家與常常失敗,因而兩人皆感苦惱。」醫生乃介紹一番性心理
授查
说門:但
安知難
,俺家若漠,今年六十九歲了,他仍象娶我時一般,每週染答佢,我等收拾枱上物件下班焉。, 城有間公立醫院,為實施性知識教育,掛觀招雜於門口,因爲自聆指導,男的虎虎有餘,全無法事之弊也。
·上娄] 性知識諮灣站」「日有老太婆來請教醫生說:佐治拼口話:「哈哈,此種醫生我亦可做!一但無人 「係性封出之國,但在本能上嘅爭,不難於對面前,二婚怨言,而想勸慰,並如碴貼鼓勵以消其心理障碍。兩 中解,曾摸摸者就唱小。伊莉法間點前抵法,競技版,西安,此對夫婦,還來西安名產宮島食品監花糖, 以皰醫生。 高性覑都如今的有出種事否?教授當相信已布,大監軍,當鐵,此老大們,又予女的再一署,他失敗時不可口出
但有籤 問艇?
仍老敢點,歌
夕朝
夕朝
。
港,待重頭再來。
日有另一批人接上,取代了他們 展。 人生就好像一場賭博一樣,不 ̈發現及歷史問題,經常出現一些 的空缺。如今,這一批人再回返本 香港,本來就是一個十分有活 力的地方,然而,因爲本身的地理
· 心波動,這就做成了另一部份人有一
的是你所押的筹码是:[大]還是] 折,因此,就形成了一部份人的信
七十年代的時候,也會有過一機會冒出頭來。
利
不會對
中,動有人批過去
掩
去
叶在住過天
傷