A heat conducting rod, 1.40 m long, is made of an aluminum section that is 0.50 m long and a copper section that is 0.90 m long. Both sections have cross-sectional areas of of 0.00040 m2
The aluminum end and the copper end are maintained at temperatures of 40°C and 280°C, respectively. The thermal conductivity of aluminum is 205 W/m?K of copper is 385 W/m?K. The rate at which heat is conducted in the rod is closest to A) 20 W.
B) 18 W.
C) 23 W.
D) 25 W.
E) 28 W.
A
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What was the most controversial issue surrounding the nature of the Universe during the Renaissance?
a. The movement of visible galaxies b. The origins of the Universe c. The number of planets in the Solar System d. The position of Earth in the Universe e. The existence of life on planets other than Earth
If an electron vibrates up and down 1000 times each second, it generates an electromagnetic wave having a
A) period of 1000 s. B) speed of 1000 m/s. C) wavelength of 1000 m. D) frequency of 1000 Hz. E) wavelength of 1000 km.
Most active galactic nuclei are powered by
A) supermassive black holes. B) a large number of supernovae. C) mergers of compact objects. D) black hole mergers. E) extra-terrestrial civilizations.
Except for hydrogen, helium, and a little lithium, the lower-mass elements (lighter than iron) that are spread throughout the dust of the universe were created
A) during the shock of a supernova explosion. B) during the fusion process that powers the stars, and then released in supernova explosions. C) in hot white dwarf stars. D) in the original creation of the universe. E) in Kansas.