Which of the following best describes what we mean by a worm hole?
A) a hypothesized but unproven type of "tunnel" through hyperspace that connects distant points in the real universe
B) a proven way of traveling through space faster than the speed of light
C) a possible method of traveling through space faster than the speed of light
D) a discarded idea about time travel that physicists now know to be impossible
A) a hypothesized but unproven type of "tunnel" through hyperspace that connects distant points in the real universe
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Ten kilograms of water at 0°C is mixed with 10 kg of water at 100°C. The change in entropy (in cal/K) of the system is
a. 1 000 b. 480 c. ?720 d. 240 e. ?168
A cube of water ice (r = 0.917 × 10^3 kg/m3) is placed in mercury (r = 13.6 × 10^3 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.
Power: A device with a resistance of 200.0 k? is connected to a 10.0-V battery. How much power does the device use?
A. 0.50 mW B. 20,000 kW C. 0.050 mW D. 2000 kW
An AC generator has 80. rectangular loops on its armature. Each loop is 12. cm long and 8.0 cm wide. The armature rotates at 1200. rpm about an axis parallel to the long side
If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will be the maximum output voltage of this generator? A) 220 V B) 124 V C) 182 V D) 167 V E) 120 V