A circumferential steel fin is 8 cm long, 3 mm thick, and is on a 20 cm diameter rod. The surrounding air temperature is 20ºC and h = 35 W/m^2K, while the surface temperature of the rod is 300ºC. Determine a) Fin Efficiency and b) Heat transfer from the fin.
What will be an ideal response?
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Radioactive Decay: How long will it take a 4.50-kBq sample of material to reach an activity level of 0.140 kBq if the half-life of the sample is 435 years?
A. 14,478 years B. 3245 years C. 2178 years D. 1993 years
Polarization: The following items are positioned in sequence: A source of a beam of natural light of intensity I0, three ideal polarizers A, B, and C; and an observer. Polarizer axis angles are measured clockwise from the vertical, as viewed by the observer. The axis angle of polarizer A is set at 0° (vertical), and the axis angle of polarizer C is set at 50°. Polarizer B is set so that the beam intensity is zero at the observer. What are the two possible axis angle settings (less than 180°) of polarizer B?
A. 40° and 90° B. 40° and 130° C. 40° and 140° D. 90° and 130° E. 90° and 140°
The correspondence principle applies to
A) theories of submicroscopic phenomena. B) theories of macroscopic phenomena. C) all good theories.
Which of the following processes will increase the mass of the system?
A) A rock is made to move faster and faster. B) Two magnets that are initially held together by their magnetic forces are separated. C) Both of the above. D) A cup of coffee is heated. E) All of the above.