When using different points in the Earth's orbit as a baseline for a parallax experiment it is best to do the observations:
A. 1 day apart.
B. 6 months apart.
C. 1 month apart.
D. 1 year apart.
E. 2 years apart.
Answer: B. 6 months apart.
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In the shear mode II of fracture, the crack propagates _________to the forces that produce the shear stress.
What will be an ideal response?
In which layer of Earth's atmosphere is ultraviolet light absorbed?
A) exosphere B) thermosphere C) stratosphere D) troposphere
Which of the following provides the strongest evidence to support the claim that there is a black hole at the center of our galaxy?
A) We observe many sources of x-rays near the center of our galaxy. B) Infrared and radio observations show a large concentration of gas near the center of our galaxy. C) The motions of the gas and stars indicate that the galactic center has a mass millions of times that of the Sun within a region less than 1 light-year across. D) We observe a large, dark object that absorbs all light at the center of our galaxy.
Explain the statement: "At the same pressure, cold air is more dense than warm air."
What will be an ideal response?