A 100-g cube of ice is heated from -120°C to +120°C. In which of the following processes is the greatest amount of energy absorbed by this material?
a. warming ice to the melting point
b. melting the ice to become water
c. warming the resulting water
d. vaporizing the water to become steam
e. heating the steam
D
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Two very small plastic balls of equal mass are released from rest. One of them carries +10 µC of excess charge and the other one carries +1µC of charge
No other charges or fields are present. Which of the following statements are true about them as they move away from each other? (There may be more than one correct choice.) A) The acceleration of the 10-µC ball is 10 times that of the 1-µC ball. B) The balls always have accelerations of equal magnitude. C) The speed of the balls keeps increasing. D) The acceleration of the balls keeps increasing. E) The acceleration of the 1-µC ball is 10 times that of the 10-µC ball.
The period of the Moon's rotation on its axis is
A. much shorter than its revolution around the Earth. B. much longer than its revolution around the Earth. C. the same as its revolution around the Earth. D. longer or shorter depending on what part of the year we are in.
Which of the following is a technique used by astronomers in their search for other planetary systems?
a. Observation of the star's rotation only b. Observation of the Doppler shifts in the star's spectrum only c. Both (A) and (B) d. The search for alien signals
Suppose that an object is moving with constant acceleration. Which of the following is an accurate statement concerning its motion?
A) In equal times its speed changes by equal amounts. B) In equal times its velocity changes by equal amounts. C) In equal times it moves equal distances. D) The object is not moving; it is at rest. E) A statement cannot be made without additional information.