Chapter 1: Problem 9
1.9 If \(P\) is a force and \(x\) a length, what are the dimensions (in the \(F L T \text { system })\) of (a) \(d P / d x\) (b) \(d^{3} P / d x^{3},\) and (c) \(\int P d x ?\)
Chapter 1: Problem 9
1.9 If \(P\) is a force and \(x\) a length, what are the dimensions (in the \(F L T \text { system })\) of (a) \(d P / d x\) (b) \(d^{3} P / d x^{3},\) and (c) \(\int P d x ?\)
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Get started for freeA compressed air tank in a service station has a volume of \(10 \mathrm{ft}^{3} .\) It contains air at \(70^{\circ} \mathrm{F}\) and 150 psia. How many tubeless tires can it fill to 44.7 psia at \(70^{\circ} \mathrm{F}\) if each tire has a volume of 1.5 \(\mathrm{ft}^{3}\) and the compressed air tank is not refilled? The tank air temperature remains constant at \(70^{\circ} \mathrm{F}\) because of heat transfer through the tank's large surface area.
A closed tank having a volume of \(2 \mathrm{ft}^{3}\) is filled with \(0.30 \mathrm{lb}\) of a gas. A pressure gage attached to the tank reads 12 psi when the gas temperature is \(80^{\circ} \mathrm{F}\). There is some question as to whether the gas in the tank is oxygen or helium. Which do you think it is? Explain how you arrived at your answer.
The sled shown in Fig. \(P 1.76\) slides along on a thin horizontal layer of water between the ice and the runners. The horizontal force that the water puts on the runners is equal to \(1.2 \mathrm{lb}\) when the sled's speed is \(50 \mathrm{ft} / \mathrm{s}\). The total area of both runners in contact with the water is \(0.08 \mathrm{ft}^{2}\), and the viscosity of the water is \(3.5 \times 10^{-5} \mathrm{lb} \cdot \mathrm{s} / \mathrm{ft}^{2}\) Determine the thickness of the water layer under the runners. Assume a linear velocity distribution in the water layer.
If \(p\) is a pressure, \(V\) a velocity, and \(\rho\) a fluid density, what are the dimensions (in the \(M L T\) system) of (a) \(p / \rho\) (b) \(p V \rho,\) and (c) \(p / \rho V^{2} ?\)
When a 2 -mm-diameter tube is inserted into a liquid in an open tank, the liquid is observed to rise \(10 \mathrm{mm}\) above the free surface of the liquid (see Video \(V 1.10\) ). The contact angle between the liquid and the tube is zero, and the specific weight of the liquid is \(1.2 \times 10^{4} \mathrm{N} / \mathrm{m}^{3}\). Determine the value of the surface tension for this liquid.
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