Earth's original atmosphere was
A) very similar to the atmosphere we have today.
B) rich in both O2 and O3.
C) obliterated after the birth of the Sun.
D) a mixture of N2, CO2, and O3.
Answer: C
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Imagine yourself in a universe that is exhibiting a blue shift. This must mean:
it's expanding much faster than our Universe. it's expanding, but in a jerky fashion. it's collapsing. it's in a steady state, neither expanding nor collapsing. there's no such thing as a blue shift of light waves.
If the distance to the nearest star is 4.2 light-years, then
a. the star is 4.2 million AU away. b. the light we see left the star 4.2 years ago. c. the star must have formed 4.2 billion years ago. d. the star must be very young. e. the star must be very old.
Collisions in Two Dimensions: Two vehicles approach a right angle intersection and then suddenly collide. After the collision, they become entangled. If their mass ratios were 1:4 and their respective speeds as they approached the intersection were both 13 m/s, find the magnitude and direction of the final velocity of the wreck.
A. 11 m/s at 14° with respect to the original direction of the lighter car B. 16 m/s at 76° with respect to the original direction of the lighter car C. 11 m/s at 76° with respect to the original direction of the lighter car D. 26 m/s at 76° with respect to the original direction of the lighter car E. 16 m/s at 14° with respect to the original direction of the lighter car
The luminosity of the Sun is a measure of:
A) the energy received by the Sun on Earth's surface. B) the energy received by the Sun at the location of Earth. C) the energy received by the Sun at any location in the solar system. D) the energy emitted by the Sun at the photosphere. E) the total energy emitted by the Sun in all directions.