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