報日僑華
刋盏育教頁一第張叫第日四初月一十年丑癸圈夏
WAH KIU YAT PO
三期星
日八十月一十年三七九一曆公年二十六國民華中
方朝阳花
攝記本
影者報
黄歇子行本 大
多年
曲服
TIL
目節彩精項各節港香
(GRUIT
運輸箱頭什貸及米
1974中學會考試題預習專欄
U be the kupthrust of water,
Mg be the weight of the Body
M be the mass of the body and
堅道書院上海
4(slope
W
物理科
陸永爉:
graph): tane 2/2.5
10.07.
PHYSICS (4)
9.8
ms-2
displace-0.2.
0.4
(a)
Solution
ment (om)
time (sec)
averagy
velocity (cm/sec)..
Plotting a graph of ve
13
(sec)
(1) The trolley roves with a uniform
acceleration.:
(11) The slope of the graph measures
the acceleration. It is
AB .10
BC:
The acceleration is 10 cm-s* (iii) By Newton's Second Law of
Motion, ma
The mass, ma
20 1980 ..: 1.0. (takınız g as 980 cm-s2
.1960
The force that sinks the body, F. W-U Since F Ma, the acceleration in water = &= F/M.
The upthrust equals
to the weight of water displaced: -U Ng/0.75
W-U
Mg - 0775
u=10ms W=1ng.
(negative for retardation) When it sinks to a maximum depth; its velocity is zero, and the body starts floating up to, the surface again.
If H demotes the maximum depth,
-2a = v - u
2(-5)H
H
0
15
uat:
tü/a
(b) The period of oscillation of a
simple peridulum (T) depends on the pendulum length and the gravity (g)
The pendulum length is constant. The only factor affecting T is g The relative
oscillation:
of the simple
pendulum to:
the trolley
is due to.".
the component 9
Therefore,
g cose
Ecose
That is, ita period of oscillet- tion is longer than on 2 level plane!
(o) The mass possesses an initial
velocity, u, when released at a height of 217 m; 4 m/s
The time taken for the flight The displacement (a vector) rele tive to the starting point is S= 217 m
The acceleration = -·-·
u4m/
tat
5t
217 0 (5t + 3·1) t -7)=0
(t-7)=0
(b) A bell is dropped from rest or
to a horizontal ground of 10 m below. Assume that the ball re- bounds with of the velocity: with which it hits the ground, (1) find the time that elapses
between the first and the second impact,
1) Assuming that the time dur-
ing which the impact between the ball and the ground take 0.3.8, calculate the average force between the goound and the ball during the first impact if the mass of the ball is 1 gm.
State Newton's Laws of Motion (b) Are they all independent?..
Give reasons.
(c) Three blocks A,B,C of masses
1 kg, 2 kg, and m kg respect- ively, have a light inexter- sible string connecting B- and C. A and B are placed on a smooth inclined plane, of 309 with C. hanging over a smooth and weightless pul- ley at the top of the inclin ed plane.
(1) Find the value of m such.
that the system will be at reat.
WE CARE (11) Now suppose C is tapped
slightly so that the system acquires a a velocity of u What will happen then? (iii)Find the value, of m such that
O will move downwards with an acceleration of 1 m/s/s (iv)Find the tensions in the strings in case (iii)
7
takes 7 seconds reach the ground.
夏季
HCE
in kg
They are looking forward
seeing their uncle soon.
(A. at B. between C. among
D. of B. to :).
6. Aunt Margaret divided the
cakes
four aqual parts. (P. among Q. into R. between
S. for T. of )
There is no difference
these two books.
(P. between Q. among R. from
S. to D. at }
8. The waves beat
the rocks.
(P. over Q. against R. with
S. to T. from)
9. The swimmer dived.
sea last night. (P. ing. to R.
T. from)
10. It is a pity that our new
car has broken
nto
9. ( ).
suddenly. (P. up Q. out R. down S. into
T. off)
10. ()
SECTION. B
Fill in the blanks with the
following preposi
from, of, for in, on, with, at, to, up, off, by
Judging
Ovel
I guess that
this stone may weight up.
your help..
service
dust.
(b) Braphical method
(m/L
The time taken for this downward. flight is t sec.
10 x 3/g 35
The upward flight consumes the same. time duration, therefore,
the total time required = 3 + 3.
8.06
-250 200.7. 4:03
AB
- G-seconds
TIME
Vel. of tram passing the 1st pole
= u m/s.
Vel. of tram passing the 2nd pole
15 m/s
Distance between the two poles
Area ABCD
(BC + AD) CD
(15+)5
50
In
(15+ u)5 = 50
15 + v = 20
The velocity of the tram on passing
the first pole is 5 m/s.
The acceleration is measured by the slope of the graph
6. Solut
Pendulum length
Period of swing -
100T
4-50 347:9:14:de
2-100 317.4.10.07
150 283.9 -200 245.9 6.05
When the graph.
As produced, it
will cut the x-
axis at 0.
QA 14. 1.
CD 100
CO - 10.07;
A.
BO και AD
2 mg
By the Equation of Motion
Sut +at
.50
5u+(25)a
20
= 2u + Sa
گرا
- น + at
15
u 5a
(1), (2)
u = 5 ma
Subat. into (2)
2 ms
(2)
QAB and
AB
DA
74.7
OCD are similar triangles
CD. 00
-100 0:07
1410
be the velocity of the aeroplane relative to the earth:
be the velocity of thi wind relative to earth
be the velocit of the plane to air
2VV cos(1804
-2V
橋準
1974 中學入學試
試題預習專欄
英文辣習
智慧出式柱主
SECTIONA
(multiple choice)
100 mph
40mph
-45°)
Choose the beat answer.
LETTER in brackets.
Write the
Example:
We are pointing
bird's nest.
the
(A. from B. out
at
D. in E. of).
(c)
=10000-1600+200x40 co3450
116008000/ 2 2 17257.7
V = 131.4 mph
The angle for direction of this. velocity is measured by sine law:
sin (180° - 450).
1:31.
sin
sin
40
40 sin45° 131.4 12926'S of W
Questions for the next week
1. The teacher often points
John's mistakes.
(A. off B. out Ga in D. of
E. from)
We shouli take pity. the
blind.
Don
(A. by B. of
E. to)
C. in
10.07 4.05
14. 1 - 1410
2349.9
→ 350 cm
The original length of the pendulum is 350 cm.
7. (a) A and B are two stations
700 m apart. A train starts from rest from A with constant accel- eration a; until it acquires a speed of: 20 m/s. It then travels with this speed for 5 min, and then is brought to rest by a constant retardation, b. Find (1) the values of a and b (ii) the total time of the
journey.
3. Those pupils are fond. playing football.
(A. at B. to C. of
by)
4. I an interested
funny stories. (A. in B. to.
E. from).
(ii) Since
T21
27
2. ()
D. from
3. (1
reading
C. with D. by
ܢܹܐ
2. I am thankful to you 3. We are pleased to have
to you.
4. They will leave here for Japan
24th December, 1973.
The desk was covered.
6. I bought that car:
price.
7. Joseph will be invited.
Mary,
'a very high
8. My grandfather has given
already.
dinner by
smoking
All
auty now?
9. Good students must read
their books.
10 Is the policeman
III. Fill in each blank with a suitable
Preposition.
Once upon a time thera was a very thirsty cat called Nancy. One day she found jug which is half full
milk. She tried very hard (2. Zap (3.
the milk but failed (4. do so. She couldn't reach the milk (5.) her tongue because the jug's neck was too narrow. All at once a
She good idea came (6.) her mind. dipped her paw (7.) the jug and brought it (8.) covered (9. milk. Then she licked the milk (10. her paw. She kept on doing this several times till the jug was empty.
ANSVERS
SECTION A: I. 1.C 2.D 3.0 4.A 5.3
6.0 7.P 8.9 9.5 10.R
SECTION B: II 1.from 2.for 3.of
4.on 5.with 6.at 7.to 8. up 9. through 10.off III: 1.of 2.to 3.up 4.to
5.with.into 7.into 8.out 9.with 10. off.