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3 marksForces & Newton's Laws

CSEC Physics · 1995 · Paper 2 · Question 1(b)(iii)

A hot-air balloon has a volume of 700 m³ and the density of the air inside the balloon is 0.90 kg m⁻³. The mass of the balloon's material and load is 280 kg.

The balloon remains stationary about 100 m above the ground. State what forces are acting on the balloon, and explain how they result in no motion.

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Other parts of this question

  1. 1(a)State Archimedes' principle.[2 marks]
  2. 1(b)(i)Calculate the mass of air inside the balloon.[3 marks]
  3. 1(b)(ii)Determine the total weight, in newtons, of the material, load and air. (g = 10 N kg⁻¹)[2 marks]
  4. 1(b)(iv)If the density of the air outside the balloon is 1.3 kg m⁻³, calculate the weight of the air which is displaced by the balloon.[2 marks]
  5. 1(b)(v)Explain why the balloon begins to rise when the air is heated to a higher temperature.[2 marks]

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