有致送四第
2廿月一十年申戊展夏
WAH, KIU YAT PC
郭日僑學
FA
一九六九中学入学試題預
英文中學會考試題預習
Total weight of
block and added
weights (N)
英文科
(+)
·劉士俊。
物理科
(F)
陸永豐
TEST 10.
Put a tiok (/) against the word, which bes
PHYSICS (10)}
Ht. of tower H = 80 n.
一國公年七十五矿民藏中
Total weight of Coefficient
scale pan and
added weights (F):
of Kinetic fri
tion (in
Mass of lead shot = m = 3 kg. Acceleration due to gravity,
9.8 m/sec2
the meaning of each sentence
(a). Presh vegetables are good
for
with
(b) Some people are good
at for in
crossword puzzles.
Time (second) +
Distance
0.
20
45
(matres)
with
Height (metres) H-
80
75
:60
(e) Kawaa
■ little sister.
35
0
in
Potential
at
(d) He took care
of for
his old hotne
energy (joules) mgh Speed (metras/" [v=gt
sec.)
2350 (2210
0 9.8
1760 1030 19.6 29.4 39.2
O
for
(e) She is thirty yeats at
of
}}-
Kinetic «nergy (joules} {{nv2
Total energy
mgh (Joules)
0 144.0
580 11340) 2320
2350 2354
2340 2370 2320
at
put an advertisement
in
the newspapeż
They set fire
the house.
at with
for
The crops depana.
-
(b) V.R. of the windlass - 12
(The crank is 12 in. and the radius of soile
is 1 in.)
V.R, of the pulley 2 V.R. of the incline plane V.R. of the combination
- 12 x 2 x 12 -288
fficiency,
MA - YxV.R.
0.6 x 288
Load
effort
150
Effort
12
The value of the coefficient of friction
are very approximately sonstant. The average of
them is the required value.
Mass of block A - 4 lb. Mass of block B - 8 lb. (1) Total normal force.
acting," N (8+4}\b,wt/ force
Applied iorqu: • 5 LOWE, friction = f 1b.wt.
N
-0.25 x 2
3 lb.xt.
pince, the blocks are moving without
acceleration P = £
(11) Blocks A and B have
a relative motion,
therefore, friction exists
on the upper surface of B as well as the lower surface. They are fi and <respectively,
0.25.x. 4
0,25 x 12
When moving uniformly, P1 £2.
- 0.25 x 10
41b.wt.
WA+WA
G
1) I sold
few dollars.
on.
(1) There has been a quarrel for
in
between()
the two friends
In each of the following, put a tick (V) against the word which best completes the meaning of the passage,
call visit.
If we go abroad and
foreign
see.
reach
Borta
ountries we see and learn alli
WAYS:
13
things
sver
that we can never
often always
books pictures
ate or learn at home.3
we may read
them in booka ̋and
with
magazines
ORDATE
and sea-plotures of them at the cinema,''
is to travel, and
the best way to
read study
look
hava
understand
he best way to
Ber
to know and
60-
Вве .look watch
the people of other countries is to meet them in their
own homes.
Punctuate the Tollowing, and put capital lettera where necessary: E
a man who liveu la canada once bought a a small Island the island was in the middle of the great saint lawrence river than he bought six beautiful foxes and took them to the island in pre but he said to himself theas foxes will nave -
many young ones I shall kill sons of them and sell their skina I may become quite rich
2and the passage carefully...
I go to the barber every unree weeks. I don't like very short hair, so my barber doesn't cut-off auch. I have known him for almost four. years now, and when I go to him, we always talk lot. He tells me all his naws, and I tell him all He meets a lot of interesting people in his shop and he talks to most of then, so he always has a lot of news for me.
Every year my ukruer, goes to France for two zoeks for his holidays, and when he comes back to England, he has a lot of interesting nowa. While - ne is outting my hair, he tells ma about beautiful old eities and quiet little villages. stranze food and
0.6 x 288 9.87 1b we
ins, with the arrangemen« provided an errort
(of 0.87 1b.wt. can lift a load of 150 Iu.xt.
Coefficient of static friction is the ratio of the limiting friction to the normal reaction between two sliding surfaces.
Limiting force is the minimum force that causes a body to start sliding
Coefficient of kinetic friction is the a ratio of the frictioh when slap eccurs at constant speed to the normal reaction between two surfacer
To determine the coerricient of statio friction abody
A small rectangular wooden block, rests on norizontal bench, is tied to a scale-pan passes over a freely running pulley. Various weights are placed on the pan till the block. Just moves. (The bench or load should not be shaken or tapped). The force of friction, F, has reached its maximum value, the limiting value, and is equal to the total weight of th nan and the added weights.
extra weights may also be put on the top of the block and the limiting friction is determined. A table such as the following' obtained?:
drinks and many other things. I sit there and listen to the old man with open esra. One minute it becomes chair in a restaurant in Amiens.(a city in Frence)
Although my barber is old, he always tries ni things. He never says, "I have never eaten this food before, so I am not going to sat it now:"
He GRYS Instead, "Try everything once."
Here are fifteen sentences about the story. Some. them are true and some are untrue. Put a tiok against the ones that are true i
My barber cuts my hair very short.
He leaves my hair rather long.
He doesn't cut my hair
He gets his news from a lot of people. (
e) He gets all his news from France.
f) He gets all his news from ne.
He works in France. ()
he works in Amiens. (
(1) He works in England. ()
(3) I go to a restaurant in Amiens with my barber.{
(k) He tells me about a restaurant in aniens.
(1) He cute my hair in France train
(m) He tastes all new food, (n) He never eats new food.
o) He has never eaten. French fona.
Rewrite each of the sentences be but do not change the meaning. You beginning of each new sentences
in another way are given the
Wat We
kren blocks A and B are connected, the relative motion of A and B is doubled and so, is the friction
• £2 + 28,
0.25 (12
5 lb.wt.
Ans. The applied force is (1) 3 25,vt (11) 4 lb.wt, and (111) 5 3b,wt\
Questions for the coming week
19. (a) Find the acceleration of the following:
(1) A mass ga. slides down an incline-plane
of 459. The coefficient of kinetic friction between the plane and mass is 0.5
(11) Two masses of 20 gm. and 30 gm. connected,
by an inextensible string slide on r frictionless pulley
(b) Find the tension of the cord in the following i
(1) A 10-1b mass tied to the ceiling.
(11) A 10-1b iron suspended in water
(5.G. of iron • 17.8)
111) A 10 lb. mass tied on a coru and was accelerated upwards with 32 ft./kan?
a juman. Uuy sies on an inclined plans or 30°. It is pushed by a horizontal force of la lb.wt, and slides up the plane with uniform speed, what is the coefficient of kinetië friction between the surfaces?
(b) A slate plate of volume 1234 sq.cm. x 2.5
and 3.0.2.8 is submerged in a basin of mercury and water. What portions are in waraw and in mercury?
(a) A bullet of 40 gm. 45 BHÚC LAGU B ku ng wooden block which is suspended by a 2 metres: string. The bullet remains in the block and the amplitude of swing is measured to be 30. Calculate (1) the speed of the bullet bafore hitting, (ii) the lost of energy of the bulls. and (ii) the resistance of wood if the penetration is 2:
Exampler
I am taller than you.
You are not so tall AR
ann came at eight o'clock, but she t Although
He said, "I am" unwell,!! (b) He said that he sai
Henry is a slow walker.:
(c) Henry walks
Who did this? By whom
She is fond of swimmi She likes
"Answers to Test 9.
(e) khad set, ;(b) shall send, (C) disappeared, (a)
cnought, (e) have never seen, (†) make, (g) 1osts,
expect, (1) didn't you?
ours, (b) mine, (c) hers, Adj:028) (8) yours. hera, (g) ours, (b) his,
(*) some more, (b) anything, (e) every day, (d) any kore, (6) every day, (1) something, (g) something, (h) everywhere, (1) something, (3) Everybody, (a) possible, ((b) like, (c) lie, (à) among, (0) believed, (f) plan, (g) interesting. (b) shoun, fi asleep, (3) depth.
don't want to lose any of my veeta, (D) I waited, I did not finish the story in the magazine, (d) sometimes hurts me, (e) my teeth were all right.
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