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# Physic P2 F5

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### Physic P2 F5

1. 1. Physic Paper 2<br />4531/2<br />Form 5<br />
2. 2. 60 Marks<br />Answer all question<br />Section A<br />
3. 3. Question 1<br />P = ρgh<br /> = (1000)(10)(3)<br /> = 30 000 Pa<br /> = 3 × 10 4 Pa<br />No.<br />Same level will have the same pressure.<br />
4. 4. Question 2<br />Archimedes’ Principle.<br />to withstand the strong water pressure below the sea surface.<br />Volume of submarine, V = 300 m3<br />(¼)V need to be pumped so that the submarine can submerged in the water.<br />
5. 5. Question 2 cont…<br />Volume needed to be pumped, r = (1/4) V<br /> = (1/4) (300)<br />= 75 m3<br />Mass of water, m = ρr<br />= (1.2 × 103)(75)<br />= 90 000<br />= 9 × 104kg<br />
6. 6. Question 3<br />A thumbtack.<br />The thumbtack has a very small area of contact compare to the coin.<br />P = F/A<br />= (6) / (5.2 × 10-4)<br />= 1.15 × 10 4 Pa<br />
7. 7. Question 4<br />The distance between two adjacent wave fronts.<br />The wavelength are the same.<br />Diagram P<br />Straight wavefronts with a bent at the edge.<br />Diagram Q<br />The wavefronts are semi-circular.<br />
8. 8. Question 4 cont…<br />If the wavelength is longer/greater than the width of the gap, the diffracted waves are semi-circular.<br /> If the wavelength is shorter than the width of the gap, the diffracted waves are straight waves.<br />Diffraction<br />
9. 9. Question 5<br />R2 and R3<br />R1 parallel to R2 and R3<br />2.0 A<br />2.0 A<br />
10. 10. Question 5 cont…<br />R1<br />R3<br />R2<br />1/ R eff = 1/R1 + 1/(R2 + R3)<br /> = 1/3 + 1/(2+1)<br /> = 2/3<br /> R eff = 3/2 Ω<br />V = IR<br /> = 4 ( 3/2)<br /> = 6 V<br />
11. 11. Question 6<br />Current<br />Potential difference<br />Gradient = ∆y/∆x<br />= 6 / 0.6<br />= 10 VA-1<br />
12. 12. Question 6 cont…<br />Resistance<br />Avoid parallax error while taking the measurement of the voltmeter and the ammeter.<br />or<br />make sure the wire connection is tight.<br />
13. 13. Question 7<br />A wave transfer energy from one point to another.<br />A transverse wave is a wave whose particles vibrate perpendicularly to the direction of travel of the wave.<br />2 λ = 8<br />λ = 4 cm<br />
14. 14. Question 7 cont…<br /> v = fλ<br /> = (5)(4)<br /> = 20 cms-1<br />1. The speed is uniform.<br />2. Wave travels in a straight line.<br />
15. 15. Question 7 cont…<br />.<br />The change of speed of the water waves.<br />or<br />The change of depth.<br />
16. 16. Question 8<br />Kelvin, K<br />kg m-1 s-2<br />P is directly proportional to T<br />1. volume<br />2. mass<br />Pressure law.<br />Interpolation.<br />500 K<br />
17. 17. 20 marks<br />Answer one question only<br />Section B<br />
18. 18. Question 9<br />The specific heat capacity is the quantity of heat energy required to increase the temperature of 1 kg of the substance by 1°C.<br />1. Temperature of water in diagram 10.1 equal to temperature of water in diagram 10.2<br />
19. 19. Question 9 cont…<br />The number of eggs in diagram 10.2 is more than in diagram 10.1<br /> The heat needed to prepare four half-boiled eggs is bigger than for preparing two half-boiled eggs.<br />Mass of water in diagram 10.2 is more than in diagram 10.1<br />
20. 20. Question 9 cont…<br />Heat supplied to eggs in diagram 10.2 is bigger than heat supplied to eggs in diagram 10.1<br />The bigger the mass of an object, the bigger the heat capacity of the object.<br />
21. 21. Question 9 cont…<br />Suitable cooling agent : water<br /> Reasons:<br />It is not corrosive<br />It has a high specific heat capacity<br />It can absorb large amounts of heat energy.<br />It is cheap and easily available.<br />
22. 22. Question 9 cont…<br />Q = mcΘ<br />48 000 = (1.2) (910) Θ<br />Θ = 44 °C<br />Θ = 28 + 44<br /> = 72 °C<br />
23. 23. Question 9 cont…<br />Base of the kettle<br />-made of copper, with higher density and a low specific heat capacity.<br />-The kettle is more stable and can get hot quickly.<br />Body of the kettle<br />-made of aluminum, with a lower density and a low specific heat capacity<br />-The kettle is lighter and can get hot quickly<br />
24. 24. Question 9 cont…<br />Handle of the kettle<br /> -made of plastic with high specific heat capacity.<br /> -The handle will not get hot too fast<br />
25. 25. Question 10<br />simple barometer<br />-water vaporizes at low pressure<br /> -water wets the glass tube<br /> -column of the tube will be 10 m<br /> P = ρgh<br /> = (1.36 × 104)(10)(760 × 10-3)<br /> = 1.03 105 Nm-2<br />
26. 26. Question 10 cont…<br />Air pressure in Genting Highland is less than in Kuala Lumpur.<br /> From P = ρgh, when P is lower the height of the mercury column is also lower.<br /> Thus, the mercury column is lower in Genting Highland and higher in Kuala Lumpur.<br />
27. 27. Question 10 cont…<br />use Boyle’s Law<br /> P1V1 = P2V2<br /> (76 cm Hg)(12cm) = (76 cm Hg + 5 cm Hg) V2<br />V2 = 11.26 cm<br />P1V1 = P2V2<br />(76)(12) = (76 – 5) V2<br /> V2 = 12.85 cm<br />
28. 28. Question 10 cont…<br />Use Charles Law<br /> V1/T1 = V2/T2<br /> 12 / (273 + 30) = V2 / (273 + 43)<br /> V2 = 12.51 cm<br />
29. 29. Question 10 cont…<br />The increase in temperature cause the kinetic energy to increase.<br /> The rate of gas molecules bombarding the wall of the container will increase.<br /> According to Charles’ Law, when the pressure is kept constant, the increase in temperature cause the volume to increase.<br />
30. 30. 20 Marks<br />Answer all question<br />Section C<br />
31. 31. Question 11<br />Effective resistance,<br /> The total resistance of all the resistor when connected in series and parallel.<br /> 1/Reff = 1/3 + 1/(4+2)<br />Reff = 2 Ω<br />
32. 32. Question 11 cont…<br />V1 = 6V, R1 = 3Ω<br /> I1 = V1/R1<br /> I1 = 2A<br /> V2 = 6V, R2 = 6Ω<br /> I2 = V2/R2<br /> I2 = 1A<br />
33. 33. Question 11 cont…<br />The suitable metal is W.<br />Metal W has a smaller cross-sectional area, high melting point and low specific heat capacity.<br />
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