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konstantin123 [22]

3 years ago

5

Explain why not everyone can become a bodybuilder, even if they train hard enough.

1 answer:

Anni [7]3 years ago

5 0

People have diffrent body builds and bone structure

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A spherical hot-air balloon is initially filled with air at 120 kPa and 20°C with an initial diameter of 5 m. Air enters this ba

GrogVix [38]

Answer:

27.78 s

Explanation:

Assume ideal gas, since pressure and temperature of the air inside the balloon is the same as air entering the balloon, then the volume (and its rate) stays the same.

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$A = \pi d^2/4 = \pi 1^2/4 = \pi/4 m^2$

Hence the volume rate:

$\dot{V} = vA = 3*\pi/4 = 3\pi/4 m^3/s$

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Hence the time it takes to fill this much at a constant rate of 3π/4 is

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