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The atmospheric pressure of the air changes with height above sea level. The rate of change of the air pressure at a given height above sea level can be measured by the differentiable function 
f(h), in psi per foot, where 
h is measured in feet. What are the units of 
f^(')(h) ?
feet
psi
feet / psi
psi / foot
feet 
//psi^(2)
psi / foot 
^(2)

The atmospheric pressure of the air changes with height above sea level. The rate of change of the air pressure at a given height above sea level can be measured by the differentiable function f(h) f(h) , in psi per foot, where h h is measured in feet. What are the units of f(h) f^{\prime}(h) ?\newlinefeet\newlinepsi\newlinefeet / psi\newlinepsi / foot\newlinefeet /psi2 / \mathrm{psi}^{2} \newlinepsi / foot 2 { }^{2}

Full solution

Q. The atmospheric pressure of the air changes with height above sea level. The rate of change of the air pressure at a given height above sea level can be measured by the differentiable function f(h) f(h) , in psi per foot, where h h is measured in feet. What are the units of f(h) f^{\prime}(h) ?\newlinefeet\newlinepsi\newlinefeet / psi\newlinepsi / foot\newlinefeet /psi2 / \mathrm{psi}^{2} \newlinepsi / foot 2 { }^{2}
  1. Definition of f(h)f(h): f(h)f(h) is given as the rate of change of the air pressure at a given height above sea level, and it is measured in psi per foot. This means that f(h)f(h) represents how much the pressure changes (in psi) for each foot of height (hh) change.
  2. Derivative f(h)f'(h): The derivative f(h)f'(h) represents the rate of change of the function f(h)f(h) with respect to hh. Since f(h)f(h) is measured in psi per foot, the derivative f(h)f'(h) will measure the rate of change of pressure change with respect to height. In other words, it measures how the rate of pressure change itself changes with each additional foot of height.
  3. Units of f(h)f'(h): The units of f(h)f'(h) will therefore be the units of f(h)f(h) divided by the units of hh. Since f(h)f(h) has units of psi per foot and hh has units of feet, the units of f(h)f'(h) will be (psi per foot) per foot.
  4. Final Measurement: Simplifying the units, we get (psi/foot)/foot(\text{psi}/\text{foot})/\text{foot} which is equivalent to psi/foot2\text{psi}/\text{foot}^2. This means that f(h)f'(h) is measured in psi\text{psi} per square foot.

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