Cambridge Assessment International Education Cambridge ... (0625)/0625_m19_… · Cambridge Assessment International Education Cambridge International General Certificate of Secondary
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This document consists of 14 printed pages and 2 blank pages.
(i) The wind blows at a speed of 16 m / s towards the turbine blades. In one second, a volume of 24 000 m3 of air passes through the circular area swept out by the blades. The density of air is 1.3 kg / m3.
Calculate:
1. the mass of air that passes through the circular area swept out by the blades in 1.0 s
mass = ......................................................... [2]
2. the kinetic energy of the mass of air that passes through the area swept out by the blades.
kinetic energy = ......................................................... [2]
(ii) Suggest why some of the kinetic energy of the air that passes through the circular area swept out by the blades is not converted into electrical energy.
(ii) On a particular day the atmospheric pressure is 1.02 × 105 Pa. The density of mercury is 13 600 kg / m3.
Calculate the value of h indicated by the barometer.
h = ......................................................... [2]
(iii) The tube containing mercury is now tilted so that it makes an angle of 10° with the vertical. After tilting, there continues to be a space above the mercury in the tube.
State and explain whether the vertical height of mercury in the tube is smaller, the same, or greater than the value calculated in (a)(ii).
(b) The heater has a power of 1.5 kW. The air in the room has a mass of 65 kg. The specific heat capacity of air is 720 J / (kg °C).
(i) Calculate the time it takes for this heater to raise the temperature of the air in the room from 8.0 °C to 15.0 °C.
time = ......................................................... [4]
(ii) State two reasons why the time calculated in (b)(i) is smaller than the actual time taken to raise the temperature of the air in the room from 8.0 °C to 15.0 °C.
7 (a) In Fig. 7.1, the small circles represent molecules. The arrows refer to the change of state from the arrangement of molecules on the left to the arrangement of molecules on the right.
X
Y
Fig. 7.1
Complete the following by writing solid, liquid or gas in each of the blank spaces.
1. Change of state X is from ............................................ to ............................................ .
2. Change of state Y is from ............................................ to ............................................ .[2]
(b) Explain, in terms of the forces between their molecules, why gases expand more than solids when they undergo the same rise in temperature.
(c) A cylinder of volume 0.012 m3 contains a compressed gas at a pressure of 1.8 × 106 Pa. A valve is opened and all the compressed gas escapes from the cylinder into the atmosphere.
The temperature of the gas does not change.
Calculate the volume that the escaped gas occupies at the atmospheric pressure of 1.0 × 105 Pa.
(b) In Table 9.1, tick the boxes that indicate the effect on the resistances of the resistor and of the thermistor when the p.d. across them is increased from 0 to 7.0 V.
Table 9.1
component resistance increases resistance is constant resistance decreases
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