1980-01-24 — Page 34

四期星

| 四下午七時四十五分至

演講堂上踝,共十二路

,摩龚七十五元。

本麒程將從不同的一

| BURKE - TRAN | 角度分析和討論人生的

括日菇的的

我生的意聲音

蜾穆 由數位責袭之

藝術工作者負資各人

反技法之吸收。:

,着值恩慈方面之意.

NICEK - SIKH

改對作整按出維有記

室———對水墨畫有興趣

BANKY (9)

初課程部市區中心(永安

KREKSH

真二第張九第二日七初月二十年未己歷夏

WAH KIU YAT PO

報日僑華

崧機政

「道,向與科港

一港人生活劃恋的分析。

普從

日四廿月一年〇八九一公年九十六國民華中育教僑華

| 戰···文等

HUBERKRKZE

• 適合高中至大寡握

KH&

般

|誌,本溶出若干

现生然急加

報追时:

三女們治安析大

從麗麫本的很老,提列

韓主

·

港大校外部春季 增辦四哲學課程

() ·

跟穆部八零年春李增股想發段之步骤;供我 近年因社會動不安,報名人數過多將行中心八千道中一百, 律與文章的意缉評析1,察規限額爲十七名七友IIICㄟ )成磐部市 以下哲學課程,摘要列 案之拔法與心得;投此,扶林道大校外部 (#6)RKES EHRENS1-B R° 本課程由周綠墨女」),還耘;「五——四

巫術之忍受及調有群度」,電話:「五下 四六 一十一就永安中心八樓

·報名地點:香港薄

五崙。學費一百八十五

艇繞部市區中心(永安 時四十五分在港大圈外 |六下午二時十五分至四

赖

敏限:

多篇圃得;数

ZIKUOREMO

1980

中學會考試題預習專欄

(十六)

物理

明德出版社魯榮家提供資料

Physics (16)

WK. Le

(Mill &

& Dale Press Ltd)

BAG

90*

BAC 30

Let the refractive index

of the

glass prism be n

sin50°

sin30

0.766

035

1.532

From part (a), when the angle of incidence is 50°, the angle of refraction is 30

30 60

180

120

180°

30°

By using the fact that a

light path is reversible

the angle of deviation

As shown in the figure, if the luminous object is placed at the focus of the leng it will retrace its 'path' after reflection.

Image

Object

mage, object coincide)

the focal length can be determined by measuring the object distanc (b) The focal length

20cm.

Consider the convex lens only.

Real-is-positive

20

60cm

60cm

60cm 10cm

50cm

Consider the refraction due

to the concave lens,

-50

=20

=-333-

Since v is negative,

Io is virtual and is

33 cm in front of the

concave lens,

Magnification produced by

60 30

Magnification produced by

Total

magnification

Therefore, the final image is virtual and magnified, Size of the final image

2cm F

Ang

4.(a)(1) If the length of the

wire is kept constant, the frequency of the

note emitted by the wire

18 proportional to the

square root of the tension in the wire.

150

18

50

150/50

18

250 (Hz)

the frequency is 250Hz

Let the tension be

150 200

18

18

32N the tension should: be 32N

Let the length of A be the tension of A be T and the diameter of A bed.

Then,

"the length of B is

the tension of B is ir and the diameter of B is d.

Consider the formula

2L

瓜

fundamental

frequency

vibrating

tension

mass per unit length

If is the density of the wire, then:

= fxr:

where r is the radius

the stretched wire,

or t

where dis the diameter

of the wirė.

21

frequency

by Ais

A

H

itted

frequency emitted by Bis

B

(1)+(2):

તારું)

2

If A is shorten by 10cm, then equation -(1) becomes

A-3(1-10)/7/2

ence

(2)

d(L−10)

ka(1)

L

13:

30

(3)

Original length of

A is 30cm. Ans.

B is 30x5

Original length of

20cm

(十六)

數學

明德出版社交長波提供資料

Mathematics (16)

C. P. Man

(MILL & DALE PRESS LTD.)

Exercise 8

Answer ALL questions in Section A and any Six questions in Section

SECTION

1. The first thrée terns of

geometrie progressi on

are √2, 3/2, 6/2 Find the fourth term,

A can do a piece of work vin 3 days, B in 4 days and

C. in 5. itays. How much does à receive from $940 if thes all work together?

In the figure, AB is diameter of length 13 cm, and BC = 12cm. Find the length of the tangent TA. (Geometry theorem need not be quoted when used.).

The difference between two numbers is 5 and their product is less than 4 Find the range within which the greater number lies,

5. Simplify tank

cos

sina

and

In the figure, BA.

BA, BC are tangents to the circle, centre 0. ZABC - 120′ the perimeter of the quadrilateral DABC is 10 cm longer than that of the sector ADC. Calculate the radius of the circle.

If a pair of shoes is sold for $270. The loss is 10%, If a gain of 10% is intended, how much must it he sold?

8. Find the values of P and

q if, P(x2 + x) −

4x2 + 10x is satisfied for all values of x.

SECTION B

9. å cuboid of lead, density

11.4m/c.c. measures 10 cm hy 6 cm by 4 en. It is melted down and made into spherical pellets each of radius mm. Find

(4) How many pellets can be

made (correct to the nearest whole number) the weight of each pellet in gram.

(correct to: 3 significant figures)

10.A railway engine without

coaches can travel at 80 km per hour, and its speed is diminished by a quantity with varies as the square

of the number of coaches attached. With 8 coaches

its speed is 48 km per hour, Find

(a) Its speed when there

are 10 coaches.

(b) The greater number of

coaches the engine can Move

ABCD is a cyclic

quadrilatera! inscribed in a circle with centre (), Given that AB = 8cm, JD

7 cm, BD » 13 cm and CD 10 cm, calculate (a) ZBAN, ZBCD and LCBD (b) Area of AANDEE (c) The radius of the

circle,

ABCD is a rectangle in which AB-8 cm, AD = 7 CH, APS - CR = x cm and B0 = BS

V CH.

(a) Show that the area of

the quadrilateral PORS i's (30-7x-8x+2xy)ag.em.

(b) If the area of PORS

26. cmmand y

Sq. calculate the values

(c) Prove, by calculation.

that for the larger

the

value of in (b) angle SPQ is riglit angle.

13. The first $600 for a man's. income is untaxed and he

tax at the rate of 38%%% the balance

15

paya

on 1

(a) Calculate the tax

payable on an ïucome of $1500.

(b) If a man receives $1468

after paying tax, calculate his incone before taxation.

In the figure, from an observation point 1 above see level.

of

bearings of ship's A and B. from L are N61 E and East respectively, Simultaneously it is also observed from L that the angle depression of A and B are 45 and 65 respectively. If D is the point at see level vertically beneath calculate the distances (a) from A to D (b) from B to D

(c) from A to B.

In the figure, ABCD is a quadrilateral in which

ABCD, AC and BD intersect at xu

From P

0 the mid- points of AB and CD respectively, PR and S are drawn perpendicular to the dragonal BD

(a) If PR - QS, prove that

ABC) is a parallelogram (b) If, in addition, Si

43), prove that ac & BD

In the figure, AQ - BP, AY » CX, RQ = BY, RO//cx and RB PORP: BC. Prove that

(a). ABPQ and AGXY are 1

grams,

•{b} [Q» BP?B and BAG are.

similar.

(e) Ar

AB

AQ