Chapter 1: Problem 9
What is the weight, in \(\mathrm{N}\), of an object with a mass of \(200 \mathrm{kg}\) at a location where \(g=9.6 \mathrm{m} / \mathrm{s}^{2} ?\)
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At sea level, the weight of 1 kg mass in SI units is 9.81 N. The weight of 1 lbm mass in English units is \((a) 1 \mathrm{lbf}\) \((b) 9.81 \mathrm{lbf}\) \((c) 32.2 \mathrm{lbf}\) \((d) 0.1 \mathrm{lbf}\) \((e) 0.031 \mathrm{lbf}\)
Solve this system of three equations with three unknowns using EES: $$\begin{array}{c} x^{2} y-z=1 \\ x-3 y^{0.5}+x z=-2 \\ x+y-z=2 \end{array}$$
Consider an alcohol and a mercury thermometer that read exactly \(0^{\circ} \mathrm{C}\) at the ice point and \(100^{\circ} \mathrm{C}\) at the steam point. The distance between the two points is divided into 100 equal parts in both thermometers. Do you think these thermometers will give exactly the same reading at a temperature of, say, \(60^{\circ} \mathrm{C} ?\) Explain.
Specific heat is defined as the amount of energy needed to increase the temperature of a unit mass of a substance by one degree. The specific heat of water at room temperature is \(4.18 \mathrm{kJ} / \mathrm{kg} \cdot^{\circ} \mathrm{C}\) in SI unit system. Using the unit conversion function capability of EES, express the specific heat of water in \((a) \mathrm{kJ} / \mathrm{kg} \cdot \mathrm{K}\) (b) \(\mathrm{Btu} / \mathrm{lbm} \cdot^{\circ} \mathrm{F}\) \((c)\) Btu/lbm-R, and (d) \mathrm{kcal} / \mathrm{kg} \(^{\circ} \mathrm{C}\) units.
The flash point of an engine oil is \(363^{\circ} \mathrm{F}\). What is the absolute flash-point temperature in \(\mathrm{K}\) and \(\mathrm{R}\) ?
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