The Trojan asteroids have orbits that:
A) are, on average, closer to the Sun than we are.
B) cross the orbit of Earth at perihelion.
C) cross the orbit of Mars, but not Earth, at perihelion.
D) stay sixty degrees ahead of or behind Jupiter.
E) stay out beyond Neptune.
D
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Radioactive Decay: Suppose that in a certain collection of nuclei there were initially 1024 billion nuclei, and 20.0 minutes later there was only 1.00 billion nuclei left, the others having decayed. On the basis of this information, how many nuclei would you estimate decayed in the first 6.00 minutes?
Fill in the blank(s) with the appropriate word(s).
How is the existence of Earth's unique atmosphere explained?
A) The oxygen in Earth's atmosphere is a result of early life on Earth. B) Volcanic gases containing nitrogen were outgassed from Earth's interior. C) As Earth cooled, water vapor fell out of the atmosphere to form the oceans. D) Ultraviolet radiation from the Sun freed the hydrogen, allowing it to escape. E) When Earth formed, its atmosphere formed from the gases most common in the early solar system.
Which force is strongest within an atomic nucleus?
A) strong B) weak C) electromagnetic D) gravity E) They are all equal.
An oil film floats on a water surface. The indices of refraction for water and oil, respectively, are 1.333 and 1.466 . If a ray of light is incident on the air-to-oil surface at an angle of 40.0° with the normal, what is the angle of the refracted ray in the water?
a. 37.0° c. 24.2° b. 26.8° d. 28.8°