The end of a compass needle that points to the south pole of a magnet is the
A) north pole.
B) south pole.
C) both of these
Answer: A
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The Greeks abandoned their earliest cosmological theory (planets moving in simple circles around Earth) because
A) it did not agree with their observations of the planets. B) it seemed messy and unsatisfying. C) they came to believe that Earth should be at the center of things. D) they came to believe that the sun should be at the center of things. E) Actually, they never did abandon or revise their earliest theory--it was not altered until the time of Copernicus.
700 J of heat are added to 12 moles of an ideal monatomic gas at constant volume. What is the change in temperature?
A) 4.7 K B) 5.2 K C) 5.8 J D) 6.8 K E) 9.3 K
Elastic Collisions: A 320-g air track cart traveling at 1.25 m/s suddenly collides elastically with a stationary 270-g cart. What is the speed of the 270-g cart just after the collision?
A. 0.678 m/s B. 0.106 m/s C. 1.36 m/s D. 1.14 m/s E. 2.72 m/s
A person's near point is 25 cm, and her eye lens is 2.7 cm away from the retina. What must be the focal length of this lens for an object at the near point of the eye to focus on the retina?
A) -2.4 cm B) 3.4 cm C) 2.6 cm D) -3.4 cm E) 2.4 cm