The kinetic energy of a planet is maximum when it is
A) closest to the Sun.
B) farthest from the Sun.
C) least accelerating.
D) none of the above
Answer: A
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Assuming that features you see on Mars are similar to features found on Earth, what would a casual inspection of the interactive photo of Mars lead you to suspect about water on Mars?
A. Abundant surface water is found in large, brownish pools inside craters. B. There are numerous small streams flowing with water. C. Surface water only exists as frozen ice. D. No surface water currently exists in any form.
Which of the following is that form of energy associated with an object's location in a conservative force field?
a. potential c. bio-chemical b. thermal d. kinetic
Which two factors are most important to the existence of plate tectonics on Earth?
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Magnifying Glass With the Image at Infinity: A lens of focal length 90 mm is used as a magnifier by a person with a near point of 25 cm. The object being viewed is 9.9 mm long, and is positioned at the focal point of the lens. What is the angle subtended by the image at infinity, in milliradians?
A. 110 mrad B. 73 mrad C. 37 mrad D. 147 mrad E. 183 mrad