Weather occurs in which layer of the atmosphere? Why?
What will be an ideal response?
The troposphere is where convection occurs, which leads to weather.
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A 2500-N pile-driver ram falls 10 m and drives a post 0.1 m into the ground. The average impact force on the ram is
A) 2,500 N. B) 25,000 N. C) 250,000 N. D) 2,500,000 N.
According to author Norman Mailer from his book Of a Fire on the Moon, quoted in the opening section,
A) powerful new science-based technologies are bringing about a better life on this planet. B) the creation of Earth was a beautiful and spiritually significant event for the human race. C) intelligent extraterrestrial life forms probably exist in many places, and may visit Earth in the near future. D) the establishment of a technology base on the moon is a crucial step in the exploration of the solar system. E) science is moving us rapidly along new paths, but we haven't stopped to consider where those paths might lead.
Hard water is due primarily to dissolved salts of which elements?
a. Zinc and copper b. Calcium, iron, and magnesium c. Sodium and potassium d. Sodium and chlorine
Starting from rest, a car travels 1350 meters in 1.00 minute. It accelerated at 1.0 m/s2 until it reached its cruising speed. Then it drove the remaining distance at constant velocity. What was its cruising speed?