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3 years ago

The air pressure inside a car tire is

Physics

1 answer:

allochka39001 [22]3 years ago

4 0

Answer:

$A=0.136\ m^2$

Explanation:

The air pressure inside a car tire is 3 atm = 303975 Pa

The force of 41,500 N of force pushing out on the tire.

We need to find the surface area of the inside of the tire. The pressure acting on an object is given by :

$P=\dfrac{F}{A}\\\\A=\dfrac{F}{P}\\\\A=\dfrac{41500}{303975}\\\\A=0.136\ m^2$

So, the surface area of the inside of the tire is $0.136\ m^2$ .

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A straight fin is made from copper (k = 388 W/m-K) and is 0.5 cm in diameter and 30 cm long. The temperature at the base of the

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Answer:

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Diameter of the fin, D = 0.5 cm = 0.005 m

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h = $20\ W/m^{2}K$

Now,

Perimeter of the fin, p = $\pi D = 0.005\pi \ m$

Cross-sectional area of the fin, A = $\frac{\pi}{4}D^{2}$

A = $\frac{\pi}{4}(0.5\times 10^{-2})^{2} = 6.25\times 10^{- 6}\pi \ m^{2}$

To calculate the heat transfer rate:

$Q_{f} = \sqrt{hkpA}tanh(ml)(T_{b} - T_{infty})$

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$Q_{f} = \sqrt{20\times 388\times 0.005\pi\times 6.25\times 10^{- 6}\pi}tanh(41.237\times 0.3)(75 - 20) = 0.119\ W$

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Answer:

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