IB myp 4-5 physics – Practice Questions- All Topics
Topic :Heat,Light and Sound- Pressure
Topic :Heat,Light and Sound– Weightage : 21 %
All Questions for Topic : Condensation and Evaporation,Pressure,Thermal Physics,Heat Transfer
Data-based question: The Eifiel Tower
The total mass of the Eiffel Tower is about 10,000tonnes. The base of the tower consists of four feet, each of which is a square of side 25m. The tower is very efficient in its use of materials – if all the metal in the tower were melted down and placed on one of the bases, it would only be about 1.5m high. As a result of its light weight and large area of its footprint, it exerts a low pressure on the ground and so does not require deep foundations.
Question:
Calculate the weight of the Eiffel Tower.
▶️Answer/Explanation
Ans: 10,000 × 103 × 9.8 = 9.8 × 107 N
Question:
Calculate the total area of the base.
▶️Answer/Explanation
Ans: 25 × 25 = 625 m
Question:
Calculate the pressure that the Eiffel Tower exerts on the ground.
▶️Answer/Explanation
Ans: \(\frac{9.8\times 10^{7}}{625}=1.57\times 10^{5}Pa\)
\(\frac{6\times 10^{6}\times 10^{3}\times 9.8}{320^{2}}=1.11\times 10^{6}Pa\)
Air pressure = 1.01 × 105 Pa
pGiza > pEiffel > Air pressure