The radius of a super-Earth generally falls in the range:
A) above 5 Earth radii.
B) between 2 and 5 Earth radii.
C) between 1.25 and 2 Earth radii.
D) between 0.75 and 1.25 Earth radii.
E) below 0.75 Earth radii.
Ans: C) between 1.25 and 2 Earth radii.
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Collisions in Two Dimensions: A 1500-kg car traveling at 90 km/h toward the east suddenly collides with a 3000-kg car traveling at 60 km/h toward the south. The two cars stick together after the collision. What is the direction of motion of the cars after collision?
A. 36.9° S of E B. 36.9° E of S C. 53.1° S of E D. 53.1° E of S
In the chrome plating of steel automotive parts, it is found that it is possible to have a high-quality coating with a current density of 0.4 A/cm 2 by heating the chromic acid solution to 65°C and using a chrome anode.
Radiant energy from the Sun reaches the Earth at a rate of 
When 30% of the radiant energy is reflected and 70% absorbed, the average temperature of the Earth's atmosphere is 253 K or -20
If the atmosphere absorbed 100% of the solar radiant energy, then what is the average temperature of the Earth's atmosphere?
A. 2.5
B. 2.8
C. 3.0
D. 3.6
E. 4.6
Why is the era of nucleosynthesis so important in determining the chemical composition of the universe?
A) All the elements except hydrogen were produced after the era of nucleosynthesis. B) We can observe spectra from this era to determine what the primordial mix of the elements was at the beginning of the universe. C) Except for the small amount of matter produced later by stars, the chemical composition of the universe is the same now as at the end of the era of nucleosynthesis. D) We can study the processes that occurred during the era of nucleosynthesis to determine how most of the elements in the universe were created. E) By knowing how much matter was created during the era of nucleosynthesis, we can determine whether the universe is open or closed.