The magnitudes of various pressures can be sensed by a
person in a moving vehicle putting her hand...

Question

The magnitudes of various pressures can be sensed by a
person in a moving vehicle putting her hand out the window and orienting the
palm of her hand toward the oncoming air. If the air temperature is 20◦C,
at what speed is the vehicle moving when she senses 1 Pa? What is the speed
when she senses 1 kPa?

Banasree · Accepted Answer

Ans. Let say,
Pressure = ½*p*v^2 , Whereas p = 1.22kg/m^3
Therefore, 1pa = 1N/m^2
1N/m^2 = ½ * 1.22* v^2
v^2 = 1.63
v = 1.27m/sec
For 1kpa = 1000N/m^2
Therefore,
1000n/m^2 = ½ * p*v^2
v^2 = 1639.34
v = 40.48m/sec.
References:
https://howthingsfly.si.edu/aerodynamics
https://cecas.

The magnitudes of various pressures can be sensed by a person in a moving vehicle putting her hand out the window and orienting the palm of her hand toward the oncoming air. If the air temperature is...

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