f4 physics final exam paper 2 2013

8/14/2019 F4 PHYSICS FINAL EXAM PAPER 2 2013

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3 Diagram 3.1 shows a metal block hanging in air from a spring balance

Diagram 3.2 shows a metal block being immersed n water from a spring balance.

Rajah 3.1 menunjukkan satu blok logam tergantung dalam udara dari sebuah neraca

spring

Rajah 3.2 menunjukkan satu blok logam ditenggelamkan ke dalam air dari sebuah neraca

spring.

A principle states that,

When a body is immersed wholly or partially in a fluid, the buoyant force acting on the

body is equal to the weight of the fluid is displaces.Satu prinsip menyatakan bahawa,

Bila suatu objek direndamkan sepenuhnya atau sebahagiannya di dalam bendalir, daya

tujah yang bertindak ke atas objek itu adalah sama dengan bendalir yang tersesar.

(a)Name the principle aboveNyatakan prinsip di atas

.........................................................................................................................

[ 1 markah/ 1 mark]

(b)Based on Diagram 3.1 and Diagram 3.2,Berdasarkan Rajah 3.1 dan Rajah 3.2,

(i) What is the apparent loss in weight for the metal block?Berapakah kehilangan berat ketara blok logam itu?

..................................................................................................................

[ 1 markah/ 1 mark]


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(ii) Explain why the spring balance shows a smaller reading?Terangkan kenapa neraca spring itu menunjukkan bacaan yang lebih kecil?

.............................................................................................................................

.............................................................................................................................[ 1 markah/ 1 mark]

(iii)Calculate the volume of the metal block. Given the density of water is 1000kgm-3.

Hitungkan isipadu blok logam tu. Diberi ketumpatan air ialah 1000 kgm-3.

[ 2 markah/ 2 marks]

(c)The water in Diagram 3.2 is replaced by oil. State what will happen to the readingof spring balance?

Air di dalam rajah 3.2 digantikan dengan minyak. Nyatakan apa yang akan

berlaku kepada bacaan neraca spring?

.................................................................................................................................

[ 1 markah/ 1 mark]

4 Rajah 4.1 menunjukkan satu spring dengan satu hujungnya ditetapkan pada satu blok

kayu.

Rajah 4.2 menunjukkan spring itu dimampatkan oleh sebiji bola keluli berjisim 0.52 kg

dengan suatu daya F.

Rajah 4.3 menunjukkan bola keluli itu bergerak selepas daya dialihkan.

[Pemalar spring = 50 N m-1]

Diagram 4.1 shows one end of a spring is fixed to a wooden block.

Diagram 4.2 shows the spring is compressed by a steel ball of mass 0.52 kg using a force,

F.

Diagram 4.3 shows the steel ball moves after the force, Fis removed.[The spring constant = 50 N m-1]


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(a) Apakah yang dimaksudkan dengan daya?

What is meant by force?

.

...[ 1 markah/ 1 mark]

(b) Menggunakan maklumat dalam Rajah 4.1, 4.2 dan 4.3

Using the information in Diagram 4.1 , 4.2 and 4.3,

Hitungkan,

Calculate,

(i) Pemampatan,xspring tersebut.

The compression, x of the spring.

[ 1 markah/ 1 mark]

(ii) Tenaga keupayaan kenyal tersimpan ketika spring itu dimampatkan.

The elastic potential energy stored in the spring when the spring is compressed.

[2 markah/ 2 mark]


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(iii) Halaju, vbola keluli itu apabila daya F dialihkan.

The velocity, v of the steel ball when the force F is removed.

[ 2 markah/ 2mark]

(c) Apakah prinsip yang digunakan bagi jawapan anda di 4(b)(iii).

What is the principle used for your answer in 4(b)(iii).

...................................................................................................................................

[ 1 markah/ 1 mark]

5 Diagram 5.1 and Diagram 5.2 shows the arrangement of apparatus used in experiment

regarding to a physics law.

Rajah 5.1 and Rajah 5.2 menunjukkan satu susunan radas yang digunakan dalam

eksperimen berkaitan dengan suatu hukum fizik.

(a)State the function of Bourdon Gauge.Nyatakan fungsi Tolok Bourdon.

....................................................................................................................................

[1 markah]


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(b)Based on Diagram 5.1 and Diagram 5.2, compare;Berdasarkan Rajah 5.1 dan Rajah 5.2, bandingkan;

(i) The reading of Bourdon gauge.Bacaan Tolok Bourdon.

.........................................................................................................................

[1 markah]

(ii) The volume of the air in the airtight container.Isipadu udara dalam bekas tertutup.

...........................................................................................................................

[1 markah](iii) The temperature of the air in the airtight container.

Suhu udara dalam bekas kedap udara.

...........................................................................................................................[1 markah]

(c)Based on your answer in 5(b)(i) and 5(b)(ii), state the relationship between thereading of Bourdon Gauge and the volume of trapped air.

Berdasarkan jawapan anda dalam 5(b)(i) dan 5(b)(ii), nyatakan hubungan antara

bacaan tolok Bourdon dan isipadu udara terperangkap.

. .................................................................................................................................

..................................................................................................................................

[1 markah]

(d)Name the physics law involved in 5(c).Namakan hukum fizik terlibat di 5(c).

..................................................................................................................................

[1 markah]

(e)Explain why the air bubbles formed by a fish expand as they float towards thesurface of water.

Terangkan mengapakah gelembung-gelembung udara yang dikeluarkan oleh

seekor ikan semakin mengembang apabila bergerak ke permukaan air?

..................................................................................................................................

..................................................................................................................................

..................................................................................................................................

[2 markah]


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b) Based on Diagram 6.1 and Diagram 6.2,Berdasarkan Rajah 6.1dan Rajah 6.2,

(i) compare the forces acting on the airplanebandingkan daya yang bertindak ke atas kapalterbang

vertically/secara menegak:

.....

Horizontally/secara mengufuk:

......

[2 markah]

(ii) compare the forces acting on the load.bandingkan daya yang bertindak ke atas beban.

Vertically/secara menegak:

.

.

Horizontally/secara mengufuk:

..

[2 markah]

c) Compare the type of motion of the airplane and the object.Bandingkan jenis gerakan kapalterbang dan objek.

............................................................................................................................

..................................................................................................................[1 mark]

d) Based on your answer in 6(b) and 6(c), relate the type of motion with the resultantforces acting on the aeroplane or on the load.

Berdasarkan jawapan anda dalam 6(b) dan 6(c), hubungkaitkan antara jenisgerakan dengan daya paduan yang bertindak ke atas kapalterbang atau

beban.

...........................................................................................................................

...........................................................................................................................

[1 mark]

e) Name the phenomenon shown in Diagram 6.1 and Diagram 6.2.Namakan fenomena fizik yang ditunjukkan dalam Rajah 6.1 dan Rajah 6.2.

...................................................................................................................

[1 mark]


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7 Diagram 7.1 shows the arrangement of the apparatus to determine the specific heat

capacity of an aluminium block with mass 1.0 kg. The thermometer reading is recorded

when it reached thermal equilibrium with the aluminium block.

Rajah 7.1 menunjukkan susunan radas untuk menentukan muatan haba tentu bagi satu

bongkah aluminium berjisim 1.0 kg. Bacaaan termometer direkodkan apabila ia

mencapai keseimbangan terma dengan bongkah aluminium.

(a)What is the meaning of specific heat capacity?Apakah maksud muatan haba tentu?

.....................................................................................................................................

....................................................................................................................................

[1 markah]

(b)Explain how a thermal equilibrium is achieved between the aluminium block andthe termometer.

Terangkan bagaimana keseimbangan terma dicapai antara blok aluminium dan

termometer.

....................................................................................................................................

....................................................................................................................................

....................................................................................................................................

....................................................................................................................................

....................................................................................................................................

[3 markah]


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(c)The immersion heater supplied 27 kJ of energy to the aluminum block. Thetemperature rise is 25 oC. Calculate the specific heat capacity of the aluminum

block.

Pemanas rendam membekalkan 27 kJ tenaga kepada bongkah aluminium.

Kenaikan suhu ialah 25 oC. Hitungkan muatan haba tentu bongkah aluminium.

[2 markah]

(d)The value of specific heat capacity obtained in 7(c) is higher than the actual value.Some modifications need to be done to the material of the wrapper and the wall of

the glass bulb to increase the accuracy of the temperature reading.

State the suitable modification and give one reason for the modification.

Nilai muatan haba tentu yang diperolehi dalam 7(c) lebih besar daripada nilaisebenar.

Beberapa pengubahsuaian perlu dilakukan kepada bahan pembalut dan dinding

bebuli kaca untuk menambah kejituan bacaan suhu.

Nyatakan pengubahsuaian yang sesuai dan berikan satu sebab untuk

pengubahsuaian itu.

(i) Type of the X wrapper material:Jenis bahan bagi bahan pembalut X:

.........................................................................................................................

Sebab/ Reason:

.........................................................................................................................

[2 markah]

(ii)Thickness of the glass bulbs wall:Ketebalan dinding bebuli kaca:

.........................................................................................................................

Sebab/ Reason:

.........................................................................................................................

[2 markah]


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(d)Q, R, and S are three different types of materials used as a prism in periscope.Table 8 shows the characteristics of each material.

Q, R, dan S adalah tiga jenis bahan yang berbeza digunakan sebagai prisma di

dalam periskop.

Materials/

Bahan

Refractive index/

I ndeks Biasan

Critical Angle/

Sudut GentingQ 1.25

R 1.33

S 1.52

(i) Calculate the critical angle for each material and fill in Table 8Hitungkan sudut genting bagi setiap bahan dan lengkapkan Jadual 8.

[ 3 marks/ markah]

(ii)Based on answer in 8(d) (i), state the most suitable material to be used inperiscope.

Berdasarkan jawapan di 8(d)(i), nyatakan bahan yang paling sesuai untuk

digunakan dalam periskop

..............................................................................................................................

[ 1 mark/ markah]

(iii) State onereason for your answer in 8(d)(ii)?

Nyatakan satusebab bagi jawapan anda di 8(d)(ii)?

..........................................................................................................................

............................................................................................................................

[ 1 mark/ markah]

(e)Mirror can also used in periscope.Cermin juga boleh digunakan dalam periskop.

(i) State the light phenomenon applied when using a mirror.Nyatakan fenomena cahaya yang terlibat jika menggunakan cermin.

............................................................................................................................

[ 1 mark/ markah]

(ii)Give onereason why mirror is not suitable to be used compared to prismsBeri satusebab mengapa cermin tidak sesuai digunakan berbanding prisma.

............................................................................................................................

[ 1 mark/ markah]


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Section B

Bahagian B

[20 marks]

[20 markah]

Answer any onequestion from this section.Jawab mana-mana satu soalan daripada bahagian ini.

9 (a) Diagram 9.1 shows a ray of light directed perpendicularly at a side of the semicircular glass block. The ray passes through the glass block to a point O before

leaving the glass block. The angle of incidence in the glass block is 30.

Rajah 9.1 menunjukkan satu bongkah kaca semi bulatan. Satu sinar cahaya

ditujukan secara tegak ke suatu sisi blok kaca itu. Sinar itu kemudiannya

memasuki bongkah kaca itu dan menuju ke titik O sebelum keluar semula. Sudut

tuju sinar itu di dalam kaca adalah 30.

(i) What is meant by angle of incidence?Apakah yang dimaksudkan dengan sudut tuju?

[ 1 mark/ markah]

(ii)Explain how total internal reflection occurs in Diagram 9.1 above?Terangkan bagaimana pantulan dalam penuh berlaku di dalam Rajah 9.1 di

atas?

[4 marks/ markah]

(b)Diagram 9.2 and Diagram 9.3 show two rectangular glass blocks with differentoptical density and refractive index. Ray of light is directed toward the glass

blocks with the same angle of incidence 30.

Rajah 9.2 dan Rajah 9.3 menunjukkan dua buah bongkah kaca yang berlainan

ketumpatan dan indeks biasannya. Sinar cahaya ditujukan kepada kedua-dua

bongkah kaca itu dengan sudut tuju 30.


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Based on Diagram 9.2 and Diagram 9.3,

Berdasarkan Rajah 9.2 dan Rajah 9.3,

(i) compare the densities of the glass blocks.bandingkan ketumpatan bongkah kaca itu.

(ii)compare the refractive index of the glass blocksbandingkan indeks biasan bongkah kaca itu.

(iii)compare the angle of refraction of the glass blocksbandingkan sudut tuju pembiasan bongkah kaca itu.

(iv) relate the angle of refraction, r and the density of the glass blocks.hubungkaitkan sudut pembiasan,r dengan ketumpatan blok kaca.

(v) relate the angle of refraction, r and the refractive index of the glass blocks

hubungkaitkan sudut pembiasan,r dengan indeks biasan kaca.

[5 marks/ markah]


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(c)Diagram 9.4 shows a fibre optic.Rajah 9 .4 menunjukkan gentian optik.

You are required to give suggestions to design a fibre optics which can works

efficiently. Using your knowledge on light, and the properties of material, explain the

suggestion based on the following aspects;

Anda diminta untuk memberikan cadangan untuk mereka bentuk satu gentian optik

yang dapat berfungsi dengan cekap. Menggunakan pengetahuan anda tentang cahaya

dan sifat bahan, terangkan cadangan anda berdasarkan aspek berikut;

(i) the refractive index of outer and inner layerindeks biasan lapisan luar dan dalam

(ii)flexibilitykelenturan

(iii) strength

kekuatan

(iv)thickness

ketebalan

(v) density of the glassketumpatan kaca

[ 10 marks/ markah]


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Diagram 10.2/Rajah 10.2

(b) Figure 10.2 shows the cross section of the wing of an aeroplane in aerofoil

shape. Explain how the aerofoil creates a lift.

Rajah 10.2 menunjukkan keratan rentas sayap kapalterbang dalam bentukaerofoil.

Terangkan bagaimana aerofoil menghasilkan daya angkat.

[3 marks]

(c) Diagram 9.3 shows a cargo aeroplane.

Rajah 9.3 menunjukkan sebuah kapal terbang kargo.


Using the appropriate physics concept, explain the modification should be done to the

aeroplane to become a jet based on the following aspects.Menggunakan konsep fizik yang sesuai, terangkan pengubahsuaian yang perlu

dilakukan pada kapal terbang itu untuk dijadikan sebuah jet berdasarkan aspek-aspek

berikut:

(i) the material used to built the body of the jetbahan yang digunakan untuk membina badan jet

(ii) the shape of the jets bodybentuk badan jet

(iii)the engine powerkuasa enjin

(iv)detecting system

sistem pengesan


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(v) the safety system for the pilotsistem keselamatan juruterbang

[10 marks]

Section C

Bahagian C

[20 marks]

[20 markah]

Answer any onequestion from this section.

Jawab mana-mana satu soalan daripada bahagian ini.

11 (a) (i) What is meant by temperature?Apakah yang dimaksudkan dengan suhu?

[1 mark]

(ii) Explain why a frying pan made of low specific heat capacity material can be

used to cook food faster.

Terangkan kenapakah kuali yang diperbuat oleh bahan muatan haba tentu

yang rendah boleh digunakan untuk memasak makanan dengan cepat.

[3 marks]

(b)A solid substance of mass 0.5 kg is heated using an immersion heater of 240 V50 W. Diagram11.1 shows the heating curve of the substance.

Satu bahan pepejal dengan jisim 0.5 kg dipanaskan menggunakan alat pemanas

elektrik 240 V 50 W. Rajah 11.1 menunjukkan keluk pemanasan bahan tersebut.

(i) Estimate the room temperature.Anggarkan suhu bilik.

[1 mark]

(ii) What is the melting point of the substance?Apakah takat lebur bahan itu.

[1 mark]


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(iii)Calculate the specific heat capacity of the solid substance.Kira muatan haba tentu bahan pepejal itu.

[2 marks]

(iv)Calculate the specific latent heat of fusion of the substance

Kira haba pendam tentu pelakuran bahan itu.[2 marks]

(c)Diagram 11.2 shows the design of a car engine radiator.Rajah 11.2 menunjukkan rekabentuk radiator enjin sebuah kereta.

Table 11.3 shows the characteristics of four types engine and radiator systems.

Explain the suitability of each of the characteristics in Table 11.3 and then determine

them most suitable engine and radiator system to be used in a car without causing

overheating in the car engine.


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Jadual 11.3 menunjukkan ciri-ciri bagi empat jenis enjin dan sistem radiator.

Terangkan kesesuaian bagi setiap ciri-ciri dalam Jadual 11.3 dan tentukan enjin dan

sistem radiator yang paling sesuai digunakan di dalam kereta tanpa menyebabkan

pemanasan melampau pada enjin kereta.

[10 marks]

12 Diagram 12.1 shows a plasticine ball being dropped onto a metal block. The plasticine

ball changes its shape after the impact.

Rajah 12.1 menunjukkan sebiji bola plastisin dijatuhkan ke atas sebuah bongkah

logam. Bola plastisin berubah bentuk selepas hentaman.


(a) (i) Name the force involve during the impact?Namakan daya yang terlibat semasa hentaman?

[1 mark]

(ii) Explain why the plasticine ball changes its shape after the impact

Terangkan kenapa bola plastisin berubah bentuk selepas hentaman

[3 marks]

(iii) Give one suggestion to avoid the plasticine ball from changing its shape when

dropped from the same height

Beri satu cadangan bagaimana untuk mngelak bola plastisin daripada berubah

bentuk apabila dijatuhkan pada ketinggian yang sama

[1 mark]

(b) Diagram 12.2 shows our four arrangements of pilling systems P, Q, R, and S that

being used to insert pile into the ground.

Rajah 12.1 menunujukkan susunan empat system cerucuk P, Q, R, and S yang

digunakan untuk memasukkan suatu cerucuk ke dalam tanah.


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Study the specification of the four arrangement of pilling systems based on the

following aspects:

Kaji spesifikasi keempat-empat susunan system cerucuk berdasarkan aspek-aspek yangberikut:


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(i) Mass of the pile driver used to push the pile into the groundJisim pelantak cerucuk yang digunakan untuk menolak cerucuk ke dalam

tanah

(ii)Height of the pile driverKetinggian pelantak cerucuk

(iii)Pile materialBahan pelantak cerucuk

(iv)Shape at the base of the pileBentuk pada dasar cerucuk

Explain the suitability of each aspect and then determine the most suitable arrangement

to be used to insert the pile effectively.

Give reason for your choice.

Terangkan kesesuaian setiap aspek dan seterusnya tentukan system cerucuk yang

paling sesuai digunakan untuk memasukkan cerucuk dengan lebih efektif. Beri sebab

untuk pilihan anda.

[10 marks](c) A metal block with mass 50kg is being dropped onto a pile to build a tall building.

The height of the metal block from the pile is 20 m. Calculate,

Satu bongkah logam berjisim 50 kg dijatuhkan ke atas satu cerucuk untuk

membina sebuah bangunan tinggi. Tinggi blok logam dari cerucuk ialah 20 m.

Hitungkan,

(i) Weight of the metal blockBerat bongkah logam

[1 mark]

(ii) Velocity of the metal block just before it hits the pileHalaju bongkah logam sejurus sebelum menghentam cerucuk

[2 mark]

(iii) Impulsive force acted on the pile if the time of impact is 0.5 second.Daya impuls yang bertindak ke atas cerucuk jika masa hentaman ialah 0.5

saat.

[2 mark]


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SKEMA

QUESTION 1

a) Concave mirror 1

b) Reflection of light 1

c) Magnified, upright, virtual 1d) Same size with object 1

Total 4

QUESTION 2

a) Gravitational potential energy 1

b) (i) Gravitational potential energy -Kinetic energy

(ii) M1 (10)(50) = v2

M2 31.62 ms-1

1

1

1

c) The principal of conservation of energy1

Total 5

QUESTION 3

(a) Archimedess principle 1

(b) (i) 2N

(ii) Due to the buoyant Force from water acting on the block//the water float up

the boat

(iii)

m3

1

1

1

1

(c) Reading of the spring balance increase 1

Total 6

QUESTION 4

(a) The force is defined as something that can change the state of rest or uniform

motion of an object.

1

(b) (i) Pemampatan, x spring = Li- Lf = 0.20.15 m = 0.05 m

(ii)Tenaga keupayaan kenyal =

()()

Tenaga keupayaan kenyal = 0.0625 J

(iii) Tenaga keupayaan kenyal = tenaga kinetik

()

1

1

1

1

1

(c) Prinsip keabadian tenaga/

Principle of conservation of energy

1

Total 7

QUESTION 5

(a) To measure pressure 1(b) (i) The reading of Bourdon gauge in Diagram 5.2 > The reading of Bourdon 1


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gauge in Diagram 5.1/

Diagram 5.2> Diagram 5.1

(ii) The volume of air in Diagram 5.1 > The volume of air in Diagram 5.2/

Diagram 5.1 > Diagram 5.2

(iii)Temperature of air is same

1

1

(c) The higher the reading of Bourdon gauge, the lower the volume of air. 1

(d) Boyles law 1

(e) - When the air bubbles move upward to water surface, the depth decreases.

- Pressure decreases as the depth of water decreases causing the volume of air

in the air bubbles increases.

1

1

Total 8

QUESTION 6

(a) Weight is the gravitational force acts an object. 1

(b) (i) - lift is equals to weight // lift = weight- drag is equals to thrust // drag = thrust

(ii) Sum of the vertical components of the tensions in the string is equals inmagnitude to the weight hanging // vertical components of the tension inthe string (T1 and T2) are equal to W // W = T1+T2

The tension of string pulling to the left is equals to the tension ofstring pulling to the right // horizontal components of the tension inthe strings (T1 and T2) are equal and opposite

1

1

1

1

(c) the airplane is moving at a constant speed while the object is at rest 1

(d) any object at rest or moving at constant speed, the resultant force acting isequal to zero // both cases the resultant force is zero

1

(e) Equilibrium of forces 1Total 8

QUESTION 7

(a) The quantity of heat required to increase the temperature of 1kg of substance

by 1oC.

1

(b) - Heat flow from the aluminium block to the thermometer until

- Net heat flow is zero.

- Temperature of the aluminium block is equal to the temperature of the

thermometer.

1

1

1

(c)

oC-1

1

1

(d) (i) - Good heat insulator

- Prevent heat loss to surrounding

(ii) - Thin wall

- More sensitive

1

1

1

1

Total 10


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QUESTION 8

(a) (i) - draw triangle at correct position

- Shaded to show the prism

(ii) Draw the light ray

1

1

(b) Total internal reflection 1(c)

= 1.44

1

1

(d) (i)

Material Refractive index

Q 53.1o

R 48.7o

S 41.1o

(ii) material S

(iii) the incident angle of prisms must be>the critical angle//the critical angle is

smaller so that it is easy to achieve total internal reflection to occur

3

1

1

(e) (i) Reflection of light

(ii) to prevent overlapping image//image blare

1

1

Total 12

QUESTION 9

(a) (i) The angle between incident ray and normal line

(ii)increase the angle of incident ray more than 42othrough the semicircular

block (denser medium)- the refraction angle no more longer refracted in less dense medium- there is the reflection angle occur in denser medium- during this case the angle of incident is more than the critical angle- the reflection angle occur in same dense medium is called total internal

reflection.

1

1

1

1

1

(b) (i) Density diagram 9.3>9.2

(ii) The refractive index in diagram 9.2>9.3

(iii) The angle of refraction in 9.2>9.3

(iv) The higher the density of glass block, the lower the angle of refraction

(v) The higher the angle of refraction, the smaller the refraction index

1

1

1

1

1

(c) Suggestion Explaination(i) refraction index in outer - so that the total internal reflection


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layer is lower than inner

layer

occur in fibre optics

(ii)High flexibility - Can easily bend at curve part

(iii) High strength (strongmaterial)

- Not easily break

(iv) Lower thickness (thinmaterial)

- can be inserted in small space area

(v)Low density - Lighter, easy to carry

2

2

2

2

2

Total 20

QUESTION 10

(a) (i) Pressure (P) in liquid at a depth (h)is given by

P = hg, = Density of the liquid

g = Gravitational acceleration

(ii) Compare the diameter of the tube correctly

- The diameter a = diameter c and bigger than diameter b // ([a=c] >b)

Compare the pressure that exerted at point a, b and c correctly- Pressure a > Pressure c > Pressure b

Compare the speed of the water flow at point a, b and c correctly- Speed b > Speed c > Speed a

Relate the pressure and the speed to deduce a relevant physics concept- The higher the pressure, the lower the speed of the water flow

(iii) Name the physics principle correctly

- Bernoullis principle

(iv)

1

1

1

1

1

1

1

(b)

surface than its lower one.

a

lower pressure on the top surface as compared to the bottom.

lift.

1

1

1


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(c)

1

1

1

11

1

1

1

1

1

Total 20

QUESTION 11

(a) (i) Degree of hotness.

(ii)

Smaller specific heat capacity is a better heat conductor.

1

1

1

1

(b) (i) 32 oC

(ii) 77 oC

(iii) c =

()()()

()()

= 400 J kg-1oC-1

(iv) Pt = ml, (50)(7-3)(60) = (0.5)l

l = 2.4 x 104 Jkg-1

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(c)

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30/30

QUESTION 12

(a) (i) Impulsive force

(ii)The surface of the metal block is hard

- The time of impact is shorter

- The impulsive force is bigger

(iii)replace the metal block with the sponge material//put mattres//

cloth//sand/plasticine//paper//oil//rubber//spring//grass//parachute//hair//cotton//

something soft material or wrap with soft material

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(b) Characteristics Explaination

- Big mass of load - Produce bigger force duringimpact

- High position of load - Produce high velocity whenstrike the pole

- Steel pile (strong/hard) - Stronger/stiffer

- Sharp base of the pole - Produce higher pressure//easyto push the pole into the

ground

- Q is chosen - Because the pilling system Qis the big mass of pile driver,

the position of load is high,

steel pile and has sharp base of

pole.

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(c) (i) W = mgW = (50)(10)

= 500 N

(ii) ()()

(iii)

()

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Total 20

f4 physics final exam paper 2 2013

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