I believe 4 is right, that they are from the same genus.
Answer
Given,
Air enter density, ρ₁ = 2.21 kg/m³
speed of entry, v₁ = 40 m/s
Air exit density , ρ₂ = 0.752 kg/m³
speed of exit, v₂ = 180 m/s
Inlet area = 90 cm²
a) mass flow rate through nozzle.
m = 0.796 kg/s
b) exit area
Using continuity equation
Exit area of nozzle is equal to
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<span>Answer:
NASA in US using its super powerful telescope checks all the meteorites ,asteroids that may land on Earth. It deflects the asteroids ,meteorites from their respective path using copper ball . But it is not wholly practical as sometimes these meteorites get enter into key hole .</span>
Go to take picture and post it so I can see the choices for the question it will be more easy for us to answer