An object at an initial temperature of 27 oC is raised to a temperature of 877 oC. How much more energy does the object emit as blackbody radiation at the higher temperature compared to the lower temperature?
a. 32.5 b. 215.9
c. 864.5 d. 1,113,123
b
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Which of the following materials is most appropriate for a design of the magnetoresistance random access memory for a computer?
(a) Layers of Fe and Ni (b) Layers of Fe and Cr (c) Layers of Fe3O4 and MnO (d) Fe-3 wt. % Si
Pressure in a Liquid: As shown in the figure, fluid fills a container having several sections. At which of the indicated points is the pressure greatest?
A. A B. B C. C D. D E. The pressure is the same at each of the labeled points.
Molar Specific Heats: A sealed 87-m3 tank is filled with 6000 moles of ideal oxygen gas O2 at an initial temperature of 270 K. The gas is heated to a final temperature of 460 K. The atomic mass of oxygen is 16.0 g/mol. How much heat is transferred to the gas during this process? (R = 8.31 J/mol ? K)
A. 24 MJ B. 28 MJ C. 19 MJ D. 14 MJ E. 9.1 MJ
The wind speed of the air flowing over a 16-cm-diameter outside mirror is significantly higher than the speed of a vehicle. If the pressure on the front of the mirror is assumed to be stagnation pressure and the pressure on the rear is assumed to be atmospheric, the power needed to move the mirror, if the air velocity around the mirror is 30 m/s, is nearest:
(A) 0.44 hp (B) 0.39 hp (C) 0.34 hp (D) 0.29 hp