What kind of galaxies are the largest galaxies in our Universe?
A.) Spiral.
B.) Irregular.
C.) Elliptical.
Ans: C.) Elliptical.
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What number of turns on the secondary is needed to reduce the voltage from 120 V to 9.0 V if there are 40 turns on the primary of a step down transformer?
A. 3 B. 9 C. 18 D. 120 E. 530
A cube of water ice (? = 0.917 × 103 kg/m3) is placed in mercury (? = 13.6 × 103 kg/m3), which is liquid at 0° Celsius. If we ignore any possible melting of the ice cube and problems with the surface tension of mercury, the fraction of the ice cube that floats above the surface of the mercury is
A. 0.067 4. B. 0.073 5. C. 0.926. D. 0.933. E. 1.00.
Which of these is not a form of solar energy?
A) wind energy B) fossil fuel energy C) geothermal energy D) hydroelectric power
A series circuit consists of three identical lamps connected to a battery as shown in Figure OQ28.15. The switch S, originally open, is closed. What happens to the potential difference across lamp C?