Bernoulli's theorem is applicable in the case of:

1. the compressible liquid in a streamlined flow.
2. the compressible liquid in a turbulent flow.
3. the incompressible liquid in a streamlined flow.
4. the incompressible liquid in a turbulent flow.
Subtopic:  Bernoulli's Theorem |
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In a test experiment on a model aeroplane in a wind tunnel, the flow speeds on the upper and lower surfaces of the wing are $$70~\text{ms}^{-1}$$ and $$63~\text{ms}^{-1}$$ respectively. What is the lift on the wing if its area is $$2.5~\text{m}^2$$? (Take the density of air to be $$1.3 ~\text{kg m}^{-3}$$)
1. $$2.5\times 10^5~\text{N}$$
2. $$1.5\times 10^5~\text{N}$$
3. $$2.5\times 10^3~\text{N}$$
4. $$1.5\times 10^3~\text{N}$$

Subtopic:  Bernoulli's Theorem |
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A plane is in level flight at a constant speed and each of its two wings has an area of 25 m2. If the speed of the air is 180 km/h over the lower wing and 234 km/h over the upper wing surface, determine the plane’s mass. (Take air density to be 1 kg m–3).

1. 6000 kg
2. 5400 kg
3. 4320 kg
4. 4400 kg

Subtopic:  Bernoulli's Theorem |
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