module 8

MODULE 8

HEAT

MODUL

PROGRAM IBNU SINA

PHYSICS

Terbitan :-

YAYASAN PELAJARAN JOHOR

JABATAN PELAJARAN NEGERI JOHOR

MODULE 2

SECTION A

1. Diagram 1.1 and Diagram 1.2 show two types of metal blocks , P and Q being heated by 50

W immersion heater for 5 minutes.Table 1 shows information related to metal blocks, P and Q.

Rajah 1.1dan Rajah 1.2 menunjukkan dua blok P dan Q dipanaskan oleh pemanas rendam

50 W yang serupa selama 5 minit. Jadual 1 menunjukkan maklumat berkaitan blok logam P

dan Q.

Diagram 1.1 Diagram 1.2

Rajah 1.1 Rajah 1.2

Metal block

Blok logam

Mass/ kg

Jisim

Specific heat capacity / Jkg-1 ° C -1

Muatan haba tentu

Heat energy supplied / J

Tenaga haba dibekalkan

P 1.0 875 658

Q 1.0 103 1740

Table 1

Jadual 1

PROGRAM IBNU SINA TAHUN 2010

To 12 V power supply

Ke bekalan kuasa 12V

Thermometer

Metal block P

Blok logam P

Metal block Q

Blok logam Q

Felt

Thermometer

MODULE 2

(a) What is meant by specific heat capacity?

Apakah yang dimaksudkan dengan muatan haba tentu?

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

[1 mark]

(b) Calculate the rise in temperature for

Hitung kenaikan suhu bagi

(i) metal block P.

blok logam P.

(ii) metal block Q.

blok logam Q.

[3 marks]

(c) Based on your answers in 5(b), compare the rise in temperature for metal block P

and metal block Q.

Berdasarkan jawapan anda dalam 5(b), bandingkan kenaikan suhu bagi blok logam P

dan blok logam Q.

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

[1 mark]

(d) Based on the information in Table 1,

Berdasarkan maklumat dalam Jadual 1,

(i) compare the specific heat capacity of metal block P and metal block Q.

bandingkan muatan haba tentu blok logam P dan blok logam Q.

....................................................................................................................... [1

mark]


MODULE 2

(ii) relate the rise in temperature to the specific heat capacity of the metal block.

hubungkaitkan antara kenaikan suhu dan muatan haba tentu blok logam.

....................................................................................................................... [1

mark]

(e) In this experiment, the temperature is recorded when the reading on the

thermometer has achieved a constant value. State the reason why.

Dalam eksperimen ini, bacaan suhu dicatatkan apabila bacaan pada termometer

mencapai suatu nilai tetap. Nyatakan sebab.

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

2. Diagram 2.1 and Diagram 2.2 show two identical polystyrene glasses are filled by hot water

at the same temperature.

Diagram 2.3 and Diagram 2.4 shows the changes in temperature of the water after 5

minutes the water are cooled.

Rajah 1.1 dan Rajah 1.2 menunjukkan dua biji gelas polisterina diisikan dengan air panas

pada suhu yang sama.

Rajah 1.3 dan 1.4 menunjukkan perubahan suhu air itu selepas 5 minit disejukkan.


MODULE 2

(a) State the working principle used in the thermometer.

Nyatakan prinsip kerja yang digunakan dalam termometer itu

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

[1 mark ]

(b) Using Diagram 1.1 and Diagram 1.2 , compare the mass of water in the both glasses.

Menggunakan Rajah 1.1 dan Rajah 1.2 ,bandingkan jisim air dalam kedua-dua gelas.

………………………………………….……………………………………………..............

[1 mark ]

(c) Using Diagram 1.3 and 1.4, compare

Menggunakan Rajah 1.3 dan Rajah 1.4 , bandingkan

(i) the reading of the thermometer / bacaan termometer

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


Diagram 2.1

Diagram 2.1Diagram 2.4

Diagram 2.2

MODULE 2

(ii) the rate of loss of heat from the water in the glasses after 5 minutes.

kadar kehilangan haba daripada air dalam kedua-dua gelas selepas 5 minit.

...……………………………………………………………………………………...

[1 mark ]

(d) Based on your answer in c(ii) compare the quantity of heat in the water in the glasses

in Diagram 1.3 and Diagram 1.4.

Berdasarkan jawapan anda di c(ii) bandingkan kuantiti haba dalam air dalam kedua-

dua gelas pada Rajah 1.3 dan Rajah 1.4.

……..………………………………………………………………………………………..

[1 mark]

(e) Based on your answer in (a) and (d), state the relationship between mass and

quantity of heat in the water.

Berdasarkan jawapan anda di(a) dan (d) , nyatakan hubungan antara jisim dan

kuantiti haba dalam air.

.......…………………………………………………………………………………………

[1 mark]

(f) Sketch the graph temperature against time when the water in the glass in Diagram

1.1 is cooled for a long time.

Lakarkan graf suhu melawan masa apabila air di dalam gelas padaRajah 5.1

dibiarkan sejuk untuk suatu jangka masa yang panjang.

[2 marks]


MODULE 2

3. Diagram 6(a) shows a soup that is heated in a metal pot.

Diagram 6(b) shows the same type of soup is being heated in a glass(Pyrex) pot.Rajah 6(a) menunjukkan sup yang dipanaskan di dalam periuk logam.

Rajah 6(b) menunjukkan sup yang sama dengan isipadu yang sama dipanaskan di dalam periuk kaca.

(a) What is meant by specific heat capacity? Apakah yang dimaksudkan dengan muatan haba tentu?

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

[1 mark][1 markah]

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

(i) the time taken to boil the soup in the metal pot and in the glass pot. masa yang di ambil untuk mendidihkan sup di dalam periuk logam dan di

dalam periuk kaca.

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

[1 markah]


Diagram 6.1

Rajah 6.1

Diagram 6.2

Rajah 6.2

Volume of soup = 1.5 litreIsipadu sup = 1.5 litreInitial temperature = 28 0C Suhu awal =28 0C Time taken to be boiled = 5 minutesMasa untuk mendidih = 5 minitSpecific heat capacity = 500 Jkg-1 oC-1

Muatan haba tentu = 500 Jkg-1 oC-1

Volume of soup = 1.5 litreIsipadu sup = 1.5 litreInitial temperature = 28 0C Suhu awal =28 0C Time taken to be boiled = 8 minutesMasa untuk mendidih = 8 minitSpecific heat capacity = 670 J kg-1 oC-1

Muatan haba tentu = 670 J kg-1 oC-1

metal potperiuk logam

glass potperiuk kaca

MODULE 2

(ii) the temperature rises by the soup in metal pot and in the glass pot. kenaikan suhu sup di dalam periuk logam dan periuk kaca.

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

[1 markah]

(iii)state the relationship between the temperature rises and the specific heat capacity of material.

nyatakan hubungan antara kenaikan suhu dan muatan haba tentu bahan.

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

[1 markah]

(c)Water with a mass of 1500 g at 90 0C is mixed with 3000 g of water at 30 0C. The mixture is stirred.

[Specific heat capacity of water, 4200 J kg-1 0C-1] Air berjisim 1500 g pada suhu 90 0C dicampurkan dengan 3000 g air pada suhu 30 0C. Campuran itu kemudiannnya dikacau.

[Muatan haba tentu air, 4200 J kg-1 0C-1]

(i) What is the maximum temperature of the mixture observed? Berapakah suhu maksimum campuran yang diperhatikan ?

[2 marks]

[2 markah]

(ii) What is the assumption made in your calculation for (c)(i). Apakah andaian yang anda buat untuk pengiraan (c)(i).

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

[1 markah]

(d)Why is the handle of cooking pot usually made of plastic? Mengapakah pemegang periuk biasanya dibuat daripada plastik ?

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

[1 mark][1 markah]

SECTION B


MODULE 2

1. Diagram 1.1 shows a beaker of cold water is placed inside a basin of hot water.

Diagram 1.2 shows the same liquid after 10 minutes.

Rajah 9.1 menunjukkan sebuah bikar berisi air sejuk di letak dalam besen berisi air panas.

Rajah 9.2 menunjukkan cecair yang sama selepas 10 minit.

(a)(i) What is meant by heat?

Apakah yang dimaksudkan dengan haba?

[ 1 mark ] [1

markah]

(ii) Based on Diagram 9.1 and 9.2 , compare the temperature and the rate of heat transfer

between the two liquids.

Relate the rate of heat transfer and the temperature change of the liquids and deduce

a relevant physics concept.

Berdasarkan kepada Rajah 9.1 dan 9.2, bandingkan suhu dan kadar pemindahan

haba di antara kedua-dua cecair.

Hubungkaitkan kadar pemindahan haba dengan perubahan suhu cecair dan

menyimpulkan satu konsep fizik yang relevan.

[ 5 marks ]/[5 markah]


Diagram 1.1

Rajah 9.1

Diagram 1.2

Rajah 9.2

After 10 minutes Selepas 10 minit

Cold water

Air sejuk

Hot water

Air panas

MODULE 2

(a) Explain how a liquid in glass thermometer can be used to check the temperature of

sick person.

Terangkan bagaimana cecair dalam kaca termometer digunakan untuk mengukur

suhu badan orang yang sakit.

[ 4 marks ]

[4 markah ]

(c) Diagram 9.3 shows a cross-section of thermal flask that is used to keep a hot coffee.

Rajah 9.3 menunjukkan keratan rentas satu termos untuk menyimpan air kop panas.

Diagram 9.3 Rajah 9.3 Using the suitable physics concepts, suggest modifications that can be made to the

thermal flask so that it can keep the coffee hot for a longer period and also available

to keep cold drink. Your answer should include the following aspects:

Menggunakan prinsip fizik yang sesuai, terangkan pengubahsuaian yang perlu

dilakukan kepada termos supaya air kopi tersebut dapat mengekalkan kepanasan

pada masa yang lebih lama dan ia juga sesuai untuk menyimpan air minuman sejuk.

Jawapan anda hendaklah merangkumi aspek-aspek berikut:

- type of material used as the cap of the thermal flask

jenis bahan yang digunakan sebagai penutup termos

- type of inner wall and outer surface.

jenis dinding dalam dan luar


Hot coffee

Kopi panas

MODULE 2

- the density of material used

ketumpatan bahan yang digunakan

- thermal strength of the flask [ 10 marks ]

ketahanan terma termos [ 10 markah ]

2 Diagram 10.1 and diagram 10.2 show the readings of two identical thermometers,

one placed in a beaker containing 500g of water, and another in 500g of cooking oil

which have been heated for 2 minutes. Both liquids are heated at the same rate of

heat. The initial temperature for both liquids were 28 0C.

Diagram 10.1 Diagram 10.2

(a) (i) What is the meaning of specific heat capacity?

[ 1

mark ]

(ii) Using Figures 10.1 and 10.2, compare the temperature, the rate of heat flow

and specific heat capacity.


MODULE 2

Relate the specific heat capacity with the rise of temperature to deduce a physic

concept.

[ 5 marks ]

(b) In the day time, the wind blows from the sea to the land. Explain why this

phenomenon happens?

[ 4 marks ]

(c) Diagram 10.3 shows the features of a car engine radiator that is used to

absorb the heat from the car engine.

Cooling coil

Diagram 10.3

Using your knowledge on the features of cooling liquid and the design of the

car engine radiator, explain how you would design a radiator that can

absorb a large quantity of heat in a short time.

[ 10 marks ]


Cooling liquidFin blade

Fan

MODULE 2

3.

Figure 9.1(a) /rajah 9.1(a) Figure 9.2 (b)/ rajah 9.2 (b)

Figure 9.1(a) shows a boy pouring hot coffee into a cup. The hand of the boy

is not scalded by the coffee droplets that are spattered from the kettle.

Figure 9.1.(b) shows hot coffee spilling over and getting onto his hand and his

hand gets scalded because of the heat capacity in it.

Rajah 9.(1)(a) menunjukkan seorangudak lelaki sedang menuang kopi ke dalam

cawan Tangan budak tersebut tidak melecur apabila terpercikair kopi yang panas itu..

Rajah 9.1(b) menunjukkan kopi panas tertumpah ke atas tangannya dan tangannya

melecur kerana terdapat muatan haba di dalamnya.

a) What is meant by heat capacity?

Apakah maksud muatan haba

[1 mark]/ [1mark]

b) Using diagrams 9.1(a) and 9.1(b) , compare the situations , when the coffee

droplets spatters on his hand and when the hot coffee from the kettle spills

onto his hand.


MODULE 2

Menggunakan rajah 9.1(a) dan 9.1(b) bandingkan situasi apabila titik-titik air kopi

mengenai tangan budak tersebut dan apabila air kopi panas tertumpah ke atas

tangannya.

State the relationship between the heat capacity and the mass .

Nyatakan hubungan diantara muatan haba dengan jisim

[ 5 marks]

a) Explain why water is normally used as a cooling agent in a car engine.

Terangkan mengapa air digunakan bahan penyejuk dalam enjin kereta

[ 4 marks]

b) An aluminium pan of mass 500 g is heated from 25° C to 105 º C . How

much heat is absorbed by the pan ?

( The specific heat capacity of almunium is 910 Jkg °C )

Satu kuali almunium berjisim 500 g dipanaskan daripada 25° C ke 105 º C

Berapakah haba yang diserap oleh kuali itu. (Muatan haba tentu aimunium ialah 910

Jkg °C )

[4 marks[

c) As a researcher, you wish to produce an ideal cooking pan which saves

gas for the purpose of cooking. Using the appropriate physic concepts,

suggest and explain the modifications required.

Sebagai seorang penyelidik anda ingin mencipta suatu kuali , yang boleh

menjimatkan gas apabila memasak. Menggunakan konsep fizik yang sesuai

’ cadangkan dan terangkan perubahan –prrubahan yang perlu dilakukan.

[6 marks]


MODULE 2


module 8

Documents

dan rajah

dalam periuk logam

menggunakan rajah

mark b

heat module

mark c

mark d

mark e