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241415958 Physics HOTS KBAT Questions

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  CHAPTER 4 : HEAT4.1 Understanding Thermal EquilibriumAras : Aplikasi  The hand feels cold after it is rubbed with ethanol becauseD when ethanol evaporates, heat is absorbed from the body  apabila etanol tersejat, haba di pindahkan ke badan  Ans : D 4.1 Understanding Thermal EquilibriumAras : Analisis  Diagram 2 shows two beakers, P and Q. Rajah 2  menunjukkan dua buah bikar, P  dan Q.Diagram 2 / Rajah 2  The water in beakers P and Q are mied. !hich graphs shows the correct temperaturechange, , with time, t, until thermal e#uilibrium is achieved$  Air dalam bikar P  dan Q  dicampurkan. Graf manakah yang menunjukkan perubahan suhu, ,dengan masa, t , sehingga keseimbangan terma tercapai? ACB t /minθ /°C 9030 θ /°Ct /min 9030 θ /°Ct /min 9030 θ /°Ct /min 9030 Beaker P Bikar P Beaker Q  Bikar Q  200 g of water at 90˚C 200 g of water at   90˚C 100 g of water at 30˚C 100 g of water at   30˚C  Ans!er : A4.1 Understanding Thermal EquilibriumAras : Analisis %ame the physical #uantity that determines the direction of heat flow$ & 'eat( Temperature Ans : B4. Understanding #pe$i%i$ Heat Capa$it&Aras : 'enilai  )ore heat energy is re#uired to change * kg of water at *++ °  to steam than melting * kg of ice because Lebih banyak haba diperlukan untuk menukarkan * kg air pada *++ ° C kepada stim daripada meleburkan *  kg ais kerana A  specific heat capacity of water higher than specific heat capacity of ice  muatan haba tentu air lebih tinggi dari muatan haba tentu ais B  specific heat capacity of water lower than specific heat capacity of ice  muatan haba tentu air lebih rendah dari muatan haba tentu ais C  specific latent heat of vapori-ation of water higher than specific latent heat of fusion of ice  haba pendam tentu pengeapan air lebih tinggi dari haba pendam tentu  pelakuran ais   specific latent heat of vapori-ation of water lower than specific latent heat of fusion of ice  haba pendam tentu pengeapan air lebih rendah dari haba pendam tentu  pelakuran ais Ans!er : APaper ( #tru$tured questi)n *#e$ti)n A+4.1 Understanding Thermal EquilibriumAras : 'enilai  !e can not use aboratory thermometer to measure our body temperature. !hy$ !ermometer makmal tidak boleh digunakan untuk mengukur suhu badan. enapa? ....................................................................................................................................................... Ans!er :  There is no kink0 in laboratory thermometer. Therefore the temperature will fall as soon as we remove the thermometer from the mouth 1 we will not be able to measure the correct temperature of the body. 4.1 Understanding Thermal EquilibriumAras : Analisis !hy is mercury used in thermometer$ #engapakah merkuri digunakan di dalam thermometer? ....................................................................................................................................... Ans!er :  )ercury is used in thermometer because of following reasonsi3 4t does not stick to the walls of capillary tube.ii3 4ts silvery shine helps us to see temperature accurately.iii3 4ts epansion is uniform.iv3 4t does not vapori-e easily. 4.1 Understanding Thermal EquilibriumAras : Aplikasi , 'enilai 5uppose you are given the choice in winter of using either one thick blanket or two thin   blankets 6oined together. !hat would you choose 1 why$  Anda diberi pilihan ketika musim sejuk untuk menggunakan satu selimut tebal atau dua selimut nipis yang digabungkan bersama. $ang manakah akan anda pilih dan kenapa? ....................................................................................................................................... Ans!er   !e prefer two thin blankets 6oined together because the air trapped between two blankets acts as an insulator and does not allow the body heat to escape. 4.1 Understanding #pe$i%i$ -atent HeatAras : 'enilai !hy does *++7 steam is more in6urious to the skin than boiling water$  #engapakah %&&'C ap akan menyebabkan kecederaan yang lebih teruk kepada kulit daripada air mendidih? ....................................................................................................................................... Ans!er : The boiling point of water is *++ degrees elsius. &t this temperature the water will begin to change from the li#uid state to the gas state. 4n order for this change to take place, additional energy is re#uired. 4n fact, every kg of li#uid water re#uires 2.28*+ 8  9oules of heat energy 6ust to convert it to steam. This is called the antent 'eat of :apori-ation. During the conversion process, temperature does not increase. 4t is, therefore, possible to have both li#uid water and steam that eist at *++ degrees elsius. !hile they both would eist at the same temperature, the steam would have a lot more heat energy due to the additional 2.28*+ 8  9oules per kilogram of heat energy that has been absorbed. 4.4 Understanding as -a!Aras : Aplikasi/ Analisis/ 'enilai Diagram ; shows the apparatus which can be used to investigate the relationship between the temperature and pressure for a fied volume of gas. The reading of the pressure gauge is shown in the Table *. Rajah ;  menunjukkan peralatan yang digunakan untuk menyiasat hubungan antara suhu dan tekanan bagi gas pada isipadu tetap. (acaan jangka tekanan ditunjukkan dalam )adual * . Diagram ; / Rajah *  Temperature / suhu < o 3Pressure / !ekanan < kPa3+*+=.+*++2>+.8Table * / 9adual *<a3 5tate why the pressure of gas is not -ero when the temperature is + . ⁰ Bourdon gauge Tolok bourdon Rubber tubeTiub getah   Thermometer  termometer  Water   Air    Round bottom flask   Kelalang bulat  Air  udara  beaker  bikar 
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