What is the percentage of Earth's atmosphere (by volume) that is carbon dioxide (CO2)?
A) 78
B) 21
C) 3
D) 0.9
E) 0.03
E
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Part AIo experiences tidal heating primarily because __________.
a. its elliptical orbit causes the tidal force to vary as Io orbits Jupiter. b. it is located very close to Jupiter. c. it is made of relatively soft materials that deform quite easily. d. it has an elongated shape that makes it look more like an egg than a sphere.
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 long. Both sections have cross-sectional areas of
The aluminum end and the copper end are maintained at temperatures of and 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.
Homogeneity and isotropy, taken as assumptions regarding the structure and evolution of the universe, are known as
A) the cosmological principle. B) Hubble's law. C) Wien's law. D) the Grand Unified Theory. E) Olbers's paradox.
A hockey puck slides off the edge of a horizontal platform with an initial velocity of 20 m/s horizontally and experiences no significant air resistance. The height of the platform above the ground is 2.0 m
What is the magnitude of the vertical component of the velocity of the puck just before it hits the ground? A) 20 m/s B) 6.3 m/s C) 13 m/s D) 15 m/s E) 21 m/s