91Ó°ÊÓ

Select the correct statement: a) The temperature is \(10^{\circ} \mathrm{K}\). b) The temperature is \(283^{\circ} \mathrm{C}\). c) The temperature is 10 kelvins. d) The temperature is 283 Celsius.

Write each of the following in an acceptable form without using a decimal point: a) \(0.0000546 \mathrm{~kW} / \mathrm{K}\) b) \(65.3207 \mathrm{kH} / \mathrm{kg}\) c) \(54.6367 \times 10^{-6} \mathrm{MF} / \mathrm{kg}\)

Express each of the following conversions to four significant digits: a) \(340 \mathrm{Btu} / \mathrm{s}\) to watts b) 3458 degrees to radians c) 25 hectares to square meters d) 240 horsepower to watts e) \(67851.22 \mathrm{kWh}\) to joules f) \(2 \times 10^{-7}\) miles to meters g) \(40 \mathrm{mph}\) to \(\mathrm{km} / \mathrm{s}\)

Biot number, Bi, is a dimensionless number that describes the relative effect of convection to conduction heat transfer. This number is given as $$ B i=\frac{h L}{k} $$ where \(\mathrm{h}\) is the heat transfer coefficient \(\left[\mathrm{W} /\left(\mathrm{m}^{2}{ }^{\circ} \mathrm{C}\right)\right]\), and \(\mathrm{L}\) is the characteristic length [m]. What is the unit of thermal conductivity, \(k\) ?