Which of the following is not a common use of microwaves?
a. cooking c. radar
b. medical imaging d. communications
B
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A metal rod is placed between two temperature sources so that heat can flow between them. One temperature is 90.0
and the other temperature is 25.0
The length of the rod is 30.0 cm and the cross sectional area is 10.0 cm2 . If 15.0 watts of heat flows between the hot temperature and the cold temperature, then what is the coefficient of thermal conductivity for the metal?
A. 69.2 W/m•
B. 58.2 W/m•
C. 50.4 W/m•
D. 46.3 W/m•
E. 44.2 W/m•
In the lab, a relativistic proton has a momentum of 1.00 × 10-19 kg ? m/s and a rest energy of 0.150 nJ. What is the speed of the proton in the lab? (c = 3.00 × 108 m/s, mproton = 1.67 × 10-27 kg)
A) 0.170c B) 0.196c C) 0.911c D) 0.930c E) 0.951c
A main-sequence star more massive than the Sun:
A) will have less density than the Sun. B) will have more luminosity than the Sun. C) always undergoes proton-proton chain reactions to generate energy. D) always undergoes carbon-nitrogen-oxygen cycle to generate energy.
A massive star can fuse more and more massive nuclei, but this process is limited by the fact that, at some point, an element that is produced ____
a. becomes completely degenerate in the core, changing the pressure-temperature relationship b. cannot produce energy through fusion c. will only fuse in the presence of even more massive nuclei d. is not found in nature e. decays radioactively before it can undergo fusion