Scientific Notation: Express (2.2 × 106)-1/2 in scientific notation.
A. 6.7 × 10-4
B. 1.5 × 103
C. 1.5 × 10-5
D. 1.5 × 104
Answer: A
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The traditional "top-down" hypothesis of the formation of our galaxy cannot explain
a. why not all globular clusters are the same age. b. why the youngest globular clusters are in the outer halo. c. why the oldest stars are metal poor but not completely metal free. d. streams and rings of scattered stars in the halo. e. All of the other choices are correct.
You observe a galaxy that is 100 million light-years away. Which of the following do you see?
A) The light from the galaxy as it is today, and it is blueshifted. B) The light from the galaxy as it is today, and it is redshifted. C) The light from the galaxy as it was 100 million years ago, and it is blueshifted. D) The light from the galaxy as it was 100 million years ago, and it is redshifted. E) Nothing: the galaxy lies beyond the cosmological horizon.
A gold ring has an inner diameter of 2.168 cm at a temperature of 15.0°C. Determine its diameter at 100.0°C. (?GOLD = 1.42 × 10^?5/°C)
The Earth moves about the Sun in an elliptical orbit. As the Earth moves closer to the Sun, which of the following best describes the Earth-Sun system's moment of inertia?
a. decreases c. remains constant b. increases d. None of the above choices are valid.