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「螲公開組特別歡迎就說
x (0.02) x (2x10′′) (d) Work done by the load
1979
中學會考試題預習專欄
附加數學科
1.5%
Density
建議參考資料(一)
明德出版社提供
10
HYSICS
SECTION A
MECHANICS
1(a)(i) extension of the spring
0.130.1m
8 x 103 kgn
(Ans)
(b)(1) As shown in the
force diagram
per second
4000 3x10
123
(Ans)
power developed by the by the man
1004
(111)
0.03 m
Apply Hook's Law
kx
the force exerted by
the spring on X
(e) Gil should be poured into the space surrounding the screw to reduce £riction.
SECTION B HEAT, LIGHT, SOUND
(b)(i) n
(3.3x1077)(1)(3600).
1.188 x 10-3
The mass of the copper
rod is reduced by
1.188 x 10"
(Ans)
(ii) The mass of the piece
of steel is increased
kg.
by 1,188 x 107
Remains unchanged.
(b)(4)
1=5m
(c) Apply n
¥
50x 10
(500) (0.03).
15 N
and WAVE MOTION
k(a)(1) B has a higher melting
tension in the spring
(ans).
point
Apply
alance T
(11) Let
upturu
ght of
1(10).
(ii) the resultant force
acting on X
15N
58
10N (to the right)
(ALS)
(111) Apply
ration of x
19
(iv) Apply
0.12-9,5x10
0.025N
(Ans
Apply I = dgv.
0.025
rates of heat
supplied to
A and B
time required for
A to melt
completely
time required for
E to melt
completely.
mass of A
mage of B.
specific latent
heat of A
(ADS)
specific latent
heat of B
(5) (2)
-1
10 ms (Ans)
velocity of X after
2 seconds
(b)(1) Take the direction to
the right as positive
itial momentum of the
system (2)+(10)
Final momentum of the
system
where v is the comman
velocity of X and Y
the impact.
By conservatior
linear momentum
(2)(10) (2
(d)(10)(1.5x10-6)
.667x101
(ii) Let W be the weight
of liquid X and the
beaker.
WE AN
Let R be the reaction
of the balance Son
the braker when Fis:
immersed complete
in X.
3.33ms
(Aus)
(0.12)+ (4)
(9.5x 10
44025%
(Ans)
the reading of S is then 4,025N
(iii) The reating
(Ans)
(ii) Average force exerted
on X by
rate of
hange
momentum of
12N
3(a) The work done by the man
(10)x [5x 2 (0.2)
(10
x2) (10x 2)
GOJ
0.2
The vertical heigh
200..
N
(Ans)
-66,7 N
The negati sign
indicates the force.
exerted on X is to the
left.
2(a)(i) 3.75 cm
raised is
5 x 1.5x10
= 7.5 x
10′′
The potential energy gained
(4000)x(7.5x1073)
(b)(1) The amount of
5(a
(Ans)
303
(c) Efficiency.
(ii) Micrometer screw gauge (tii) Nasg of p
Useful work done Work done by the effort
X
100%
x 10
Volume of P
30
X
heat required
(0.02)x (336000)
6720J
(Ans)
(ii) The amount of heat
supplied
(0.05)× (4200)
(20-0)
4200J
(Ans)
Since the result of. (i) is greater than the result of (ii),
therefore the final
temperature of the
mixture is 0′
(iv) It is because the ice
is not c
completely me
melted and the amount
of ice molted is not
known.
a convex lens
concave
In Figure 6,
the image is virtual.
In figure 7,
0.05 -
0.505m
50.5min (Ans)
the distance between
the lens and the film
is 50.5 aim
(ií) 1. Reduce the
Lens-to-film distance (i.e. reduce the
image distance), or
Reduce the distance
between the object..
and the lens,
6(a)(i) To produce circular
waves.
(ii) To reduce the velocity
the wave.
(b)(4)
shallow portion:
(ii) Stationary wave.
(c)(i) 2,5 cm behind the plane
reflecting surface.
dot vibrat
the path difference
13cm
x wavelength
it ia a destructis
interference.
SECTION
ELECTRICITY,
MAGNÉTISM
and
ATOMIC PHYSICS
electrons
the image is real
(ii) ions
the resistance
the electrolytic cell
90
(Aus)
(d) It is because the battery
has internal resistance
and part of the voltage
is used to drive the
current through the
internal resistance,
8(a)(i) Anti-clockwise (11) There will be
NO change.
(iii) The coil will turn in
clockwise direction
and anti-clockwise
direction alternately. and will finally rest
in the position where
its plane is
perpendicular to the magnetic field.
(b)(i) The lamp will flash
(ii) The lamp does not
light up when the switch remains closed.
(iii) The lamp will flash
If a c. power supply":
is used, the lamp
will light up in all
the above processes
9(a)(i) Alpha particle
(ii) Beta particle (iii) Beta particle
(iv) Alpha particle
(b)(1) R
negative particle
S proton
the original
particle (neutral)
It is because a force
is acting on a charged
particle when it is
moving in a magnetic
field.
(c) Mass of y
(1)2
(Ans)
Mass of Y
(Ans)
T I F EN
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