Which of the following statements best describes current understanding of the eventual fate of the universe?
A) Although the accelerating expansion suggests that the universe will continue to expand forever, it is possible that future discoveries will indicate a different fate.
B) The universe will continue to expand forever, because only gravity could reverse the expansion, and it is not strong enough to do so.
C) The acceleration of the expansion will eventually lead to a Big Rip that will break all matter apart.
D) The universe will gradually decay as it continues to expand, with protons eventually decaying and black holes ultimately evaporating, leaving the universe cold and dark.
A) Although the accelerating expansion suggests that the universe will continue to expand forever, it is possible that future discoveries will indicate a different fate.
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If the distance from the Sun to the Earth is represented by roughly 15 meters, then the distance from the Earth to the Moon on the same scale would be
a. about 30 meters. b. about 10 meters. c. about 1 meter. d. small than your hand.
An 800-kHz radio signal is detected at a point 2.7 km distant from a transmitter tower. The electric field amplitude of the signal at that point is 0.36 V/m
Assume that the signal power is radiated uniformly in all directions and that radio waves incident upon the ground are completely absorbed. What is the intensity of the radio signal at that point? (c = 3.00 × 108 m/s, ?0 = 4? × 10-7 T ? m/A, ?0 = 8.85 × 10-12 C2/N ? m2) A) 170 µW/m2 B) 240 µW/m2 C) 340 µW/m2 D) 120 µW/m2 E) 86 µW/m2
From what height above the surface of the earth should an object be dropped to initially have an acceleration of 0.54g? (G = 6.67 × 10-11 N ? m2/kg2, Mearth = 5.97 × 1024 kg, Rearth = 6.38 × 106 m)
A) 2300 km B) 1700 km C) 5400 km D) 2900 km
Why did the solar nebula heat up as it collapsed?
A) Nuclear fusion occurring in the core of the forming Sun produced energy that heated the nebula. B) As it shrank in size, gravitational potential energy was converted to thermal energy. C) It was heated by radiation from nearby stars. D) The shock wave from a nearby supernova heated the gas. E) Collisions among planetesimals generated friction and heat.