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月二十(〇九九一年九十七國民黨中
青教・日八月十年午庚層夏
公眾假期(初十五)
10359078
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回
MILLE DALE PRESS
English Language (13)
PHRASAL VERBS (IV)
Choose the best answer from the choices. given.
1. You'd better act
B. If you go on shoplifting, you wil)
end
C. at
B. off
D. out
my advice
before it is too late.
A. at
9. He was very depressed when all his
plans, fell
B. on
D. off
A. out
B. through
C. off
2. You are my friend. I hope you will
10. John fell
D. over.
Mary over
some
trifles.
A. In with
c. off
A. nut with D. for
D. Rout
C. out
.n. in
A. on
B. for
Di-by.
The volcano suddenly blew
15. The principal Tet. the naughty.
1993年中學會考預習專機:
LAST SEAR
the whole city perished.
BA. out
student
·with a warning.
23. Be always ready to stand
30. The shoplifter fan
before we
could catch him..
A over
B. Into
C. off
D. out
in
A. down
Coff
C. out
B. off
D. in
own principles.
A up at
B. on at.
31. The thier was still at large.
16. Having been sick for months, John!
father passed
C up for
D. out for
police were beating,
for him,
last night.
24. He has thrown
very good job
A. out
C. by
B. down
D. away
17. As soon as I get my salary, I will:
25. The assassination has triggered
and gone off somewhere. A. Up.
Cover
A. about. C. 15
B. down
D. out
-0. on D. off
32. It was very hot and John took
shower to cool himself:
郭日僑華
一期星日四廿月二十(〇九九一)年九十七國民中(26)
A down
B. up
pay
my debts,
∙A, in
C. out
B. on
D. off
*C, over
D. off
war between
the
two
18. I don't know why she picks
nations.
A. up
33. These
experts
are capable
him all the time.
She seems to
C. over
B. on D.-off
ironing arise.
any problems that
hate him.
A. into
26. Would you lend me your pen?
Mine
A. .up
C. on
B. off
D. at
C. away
B. cat
D. off
has run
A. up to
C. in
B. down on
D. out
police had successfully crack
the triad societies.
11. It's no use hanging
Nothing is going to happen. A. round
12. John finds it hard to live
his father's expectations,
A. cn
20. Be patient, the train will pul
A.. Over
here,
B. into
19. have picked
Some Italian
C. off
D. out of
34. We expected him to dre months ago
but he lingered- in pain.
8. over
Dup
during my visit there.
A. around
A. up
C. on
B. off
D. at
t. up in
B. down
D. up to
-soon.
27. This theory has been fully tested and there is practical
confirmation. A. On C. down
C. on
D. sway
·D. aff
35. The new TV. station manages to sign
most of the best performers:
8. out
D. into
A-in
Cup
B: out
De off
A. up
∙C..in
8. on D. down
5. That heartless husband did his. wife by poisoning her. A. away with
13. have put on much weight.
td. let my dresses
I need
a bit.
C. over
6. down with D. out
A. down
C. out
B. aff.
D. in
A. up
東京迪士尼六天(逢星期日出發
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C. on
1 will stand 21. You can rely on me.
you whenever you need ma.
B. by 0. at
28. John has followed the plan
the end.
A, through
to
Answer's
1,0
2. D.
3. C
4. 8
5. A
C. up..
B. on 0..off
6. C
7.0
A. A.
9. 8 ··10. 8
11. A
12.0
13. C
14. A
15. B
29. That gambler ciced his fortune
16.0
17. 0
18. C
19. A
20. C
五天(進纖期日)
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The lawyer, is still drawing the contract for the sale.:
A on
B. off
14. We are counting on you. Don't let
at the casino
21. B
22. B
23. C
. 24. A
us
down
22. This symbol stands
love and
B. off
Tiberty.
A. through
C. off
B. away
D. out
26.0
27. B
28. A
29. B
30.
31. A 32. D
33. B
34. C
35, C
小東京五天(冰舉期三,六出)
天運星期一、三出發)
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velocity?
* 12 kg.
right with speed, 8.4 ms (b) Loss in K...
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(4 + 6 ) ( 8,4}
(Ans.
MAR
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7號金滿樓3A
#$111
1991 中學會考預習專欄。
明德出版社
MILL & DALE PRESS
Physics
Exercise 13 Momentum
(where necessary, take g = 10 ms):
Мак
1. As shown in fighendab a block of mass 4 kg travelling with speed
-1
15 ms collides with another block
of mass 6 kg travel in opposite "direction with speeds"
Figure 2(6)
the trolleys stuck together after collision, find
(a) their common velocity:
(b), the energy, lost in the impact.
3. A gun of mass 3x10 kg which can move freely on a horizontal ground,
fires a shell of mass
shel
103 kg with al If the muzzle speed of 1800 hs. system (the gun and the shell) is at rest before firing, Find
(a) the momentum of the system
before firing.
5
If
(b) the momentum of the system after
firing. (c) the recall velocity of the
just after firing.
cun
after impact, the 4 kg block returns with speed: 3 ms shour to figure
(b), find
Before Impact
5 my
4kg.
6 kg
美加歐澳特廉機票
- smooth þorizontal floor
台灣學生機票一年效期 R
Figure 1(a)
After. Impact
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Ba! 07
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smooth-hat|zontal floor
Figure 1(5)
(a) the speed of the 6 kg block.
after Impact.
(b) calculate the energy lost during
the impact.
(c) in what form will the lost
energy be dissipated?
2. As shown in figura 21a) and 2(b). the trolleys are travelling on smooth horizontal table before and after impact.
Before Impact
$3.
4. A ball of mass. 2 kg is projected horizontally with speed 12 ms"!" towards a vertical wall and is rebounced back horizontally with speed 10 ms 16 the time of stentact during the collision, is
0.1as, find
chote a momentum of the ball Before and after collision.
(b) the form acting on the wall
during collision.
Figure 4
(a) What is the velocity (magnitude and direction of A after the collision?
(b) Calculate the average forcé (magnitude and direction) on A during the collision.
(c) Calculate the average force (magnitude and direction) on B during the collision Compare the result with that of (b), 4 (d) Calculate the fraction of energy lost during the impact. In what form will the lost energy be dissipated?
Solutions
1. (a) Taking the direction
right as positive Momentum before impa (4)(15)+(6)(-6).
24 koms-12
Momentum after impact.
"(4)(-3)+{5}{v}
6v-12
conservations
_momentum.
PUBLIC
5. A ball of mass 0.4 kg is released from a height of 18m onto à horizontal floor. It rebounds to a height of 0.8 m,
(a) Calculate the velocity of the ball just before and after impact?
(b) If the ball is in contact with the floor for 0:02:$. what is the magnitude of the average force exerted by the floor on the sphere during impact?
8 ms "1
6. Two trolleys A and B move towards
1
and each other with velocity 4 ms"
respectively. The mass of tralley A is 12 kg and that of B is 3 kg.
The two trolleys remain in contact for 0.5 seconds during the collision. After the head-on
rebounds collision, B
with a +1 velocity of 4 ms 85 shown in figure 4.
before collision
Figure 2(a)
Figure 3
ans
Since the system is at rest before
(b) By Conne
momentu
momentume firing
total
Tinear
after
(c) Let the velocity of the gun be
after firing.
-{2x105)v + (103][1806) = 19
(Ans.)
The negative sig indicates the gun will recoi
(a) Momentum
the
impact
•{2}(12)
the 6kg-block will nove with 6ms to the right.
(b) K.E. before collision.
· |-|(4) (15)3 + 2(6)(6) 1
558 J
*
K.E. after collision
|||(4)(3)2 + {{6}(6) ►
126 0
Loss in energy 558 126
432.0 (Ans. 1 (c) Mainly converted into heat and
Sound energy.
2. (a) Taking the direction to the
right as positive Momentum before collision
(4)(33)+(6)(~8)
84 kgms**
Momentum after collision
(4+6) V
10 v
·10v
84:
8.4 15
(Ans.)
The trolleys will move to the
・24日
Change In momentum
(-20)-24
-44 kgms
before
(Ads)
(The negativa sige indicates in opposite direction).
Magnitude of Change in momentum is 44, kgms
(b) Magnitude of average force
- Magnitude of Rate of change of
momentum
440N
5. (a) Velocity before impact
21104128)
6 ms (downwards) Velocity just after impact
EXTOJ (OB)
4 ms (upwards)
(Ans.)
(Ans.)
(Ans,)
(b) Magnitude of Rate of change of
momentum
·(0.4)(4) - (0.4)(-6)
=200N
The average force required.
5. (a) Take the direction towards the
right as positive.
Let the velocity: of A after the collision be Vas
Initial momentum of the system
= (12){4) + (3)(-8)
24 kg
Final momentum of the system
(12)(V) + (3) (4)
12y + 12
By conservation of mome
24 = 32v + 12
the velocity of
towards the right.
(b) The average force on A
= rate of change of momentum of
A
(12)(1) - (12)(4))
-72N
0.5
Ans: The average force an
72N towards the left.
(c) The average force on B
rate of change of momentu
#72N
0.5
(318)
the average force on 8 is 72 towards the right.
we see
Compared with the result of (b), that the average force exerted on A by B is equal in magnitude with the average force exerted on @hy A but opposite in direction. Thus, it satisfies Newton's 3rd Law of Motion
(d) Since there is no change in potential energy before and after the impact, therefore the energy loss in this collision 1s equal to the kinetic energy. loss.
Initial kinetic energy
•12}{4}+3)(64
#192 J
Final kinetic energy
• †(12)(1)2 + }{3}{4}?
307
The fraction of anergy lost
Ans.)
200N+ weight of the ball
200+ (0,4)(10)
204N
(And.)
The lost energy converts mainly into heat energy and sound energy.
388 2121
3312 1188
890 1186
380 8080
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