Why might a moon's orbit be used to evaluate if it was a primary moon, formed at the same time as the planet or a feature (asteroid or comet) that was captured by the planet's gravity?
What will be an ideal response?
Because all of the planets rotate in approximately a common plane, the ecliptic, moons that also revolve around their planet are also likely to have formed at the same time as the planet, from the solar nebular, whereas objects with strongly elliptical orbits or orbits far off the plane of the ecliptic are likely to be capture objects
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A heavy block is suspended at rest by a vertical rope. When you accelerate the block upward by the rope, the rope tension
A. equals its weight. B. is zero. C. is less than its weight. D. is greater than its weight.
Today, regulations for pesticide use on foods
A) are extra sensitive to those foods eaten by older adults. B) ban substances shown to cause more than one cancer case in 1,000 over a typical lifetime of exposure. C) must consider only the pesticide exposure from eating exposed food. D) apply to raw and processed foods equally.
The Green Revolution of the 20th century was characterized by ________
A) increased awareness of the environment and environmental issues B) increased use of environmentally sound products C) advancements in agricultural techniques D) increased concern for the environment
If a river originates 200 meters above sea level and travels 100 kilometers to the ocean, what is the average gradient in meters per kilometer?
A. 0.2 meters per kilometer B. 0.5 meters per kilometer C. 5 meters per kilometer D. 2 meters per kilometer E. None of these choices are correct.