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1. Judging from its unit W/m · K, can we define thermal conductivity of a material as the rate of heat transfer through the material per unit thickness per unit temperature difference? Explain.
2. Define emissivity and absorptivity. What is Kirchhoff's law of radiation?
A box has a partition with 10% of its volume one side. The larger section of the box contains 500 Ar atoms and the smaller 100He atoms. A small hole is put into the partition. At equilibrium, what is the mean number of atoms of each type?
You drill a small hole in the side of a vertical cylindrical water tank that is standing on the ground with its top open to the air.
In a certain time, light travels 4.88 km in a vacuum. During the same time, light travels only 3.19 km in a liquid. What is the refractive index of the liquid
An ice chest at a beach party contains 11cans of soda at 6°C. Each can of soda has a mass of 0.34 kg and a specific heat capacity of 3900 J/(kg·°C).Someone adds a 6.3 kg watermelon at25°C to the chest. The specific heat capacity of watermelon is near..
It is known that the electric force of repulsion between two electrons is much stronger than the gravitational attraction. For two electrons at a distance d apart, calculate the ratio of the size of the electrostatic repulsion to that of the gravi..
Find the design cooling and heating loads of UC 2011. Consider UC 2011 is a detached room. You are free to assume any values reasonably for the calculation. Consult different charts, tables and climate data as necessary. Assuming 40% fresh air and 60..
At room temperature and pressure RbI crystallizes with the NaCl-type structure. Use ionic radii to predict the length of the cubic unit cell edge. How does this density compare with the density you calculated in part (b)?
A string attached to an oscillator at one end forms 5 nodes (counting the two ends) and produces a frequency of ? = 1.5 kHz. What is the linear density of the string
Four equal positive point charges, each of charge 6.8 C , are at the corners of a square of side 9.2 cm. What charge should be placed at the center of the square so that all charges are at equilibrium? Is this a stable or unstable equilibrium in the ..
the burner on an electric stove has a power output of 2.0kw. a 760g stainless steel tea kettle is filled with 20oc
The small skydiver, weighing 50N, sinks 1.0m into the snow when her parachute does not open, Determine the work done by the snow in stopping the person
Two charges, -Q and +Q, are located two meters apart and there is a point along the line that is equidistant from the two charges as indicated. Which vector best represents the direction of the electric field at that point?
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