Two objects attract each other gravitationally. If the distance between their centers is cut in half, the gravitational force
A) is cut to one fourth.
B) is cut in half.
C) doubles.
D) quadruples
E) remains the same
D
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The energy of a photon depends on its
A) speed. B) frequency. C) amplitude. D) all of the above E) none of the above
7.0 kg is hung from a steel wire of diameter 0.75 mm and length 2.5 meters. (S = 8.2 × 1010 N/m2; Y = 20 × 1010 N/m2)
(a) By how much does the wire stretch? (b) If the wire diameter were doubled, what would be the stretch?
Increasing the temperature of 50 grams of water by 1°C requires
A) 1 calorie. B) 50 calories. C) more than 50 calories. D) none of the above
In the activity series, Zn is more active than Pb. This means that
a. Zn is a better catalyst than Pb. b. Zn loses its electrons more easily than Pb. c. Pb is more readily oxidized than Zn. d. none of these