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2 marksHydrostatics

CSEC Physics · 1997 · Paper 2 · Question 4(a)(ii)

The graph shows how the boiling point of water varies with the pressure of the air above the water. A school in Jamaica is situated at an altitude of 1000 m. At the school, air pressure is usually about 90 kPa.

What TWO factors lead to the pressure being lower at greater altitudes?

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Other parts of this question

  1. 4(a)(i)At what temperature would you expect water to boil?[1 mark]
  2. 4(b)(i)If the weight used is 0.5 N, what is the pressure due to this weight? Convert your answer to kPa.[4 marks]
  3. 4(b)(ii)What is the total pressure acting on the contents if atmospheric pressure is 100 kPa?[1 mark]
  4. 4(b)(iii)At what temperature would the water in the pressure cooker boil?[1 mark]
  5. 4(b)(iv)What effect might the temperature identified in (iii) above have on the time it takes for the food to cook?[1 mark]
  6. 4(b)(v)To prevent accidents, the safety valve opens if the pressure inside the pressure cooker exceeds twice the pressure of the atmosphere. At what temperature does…[1 mark]
  7. 4(c)In terms of the kinetic theory of gases, why does the pressure of the gas in a sealed container rise when the temperature rises?[3 marks]

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