A group of periods is called a(n)
a. epoch.
b. millennia.
c. era.
d. eon.
c
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What is meant by "dark energy"?
A) the energy associated with dark matter through E=mc2 B) any unknown force that opposes gravity C) the repulsive agent causing the universal expansion to accelerate D) highly energetic particles that are believed to constitute dark matter E) the total energy in the Universe after the Big Bang but before the first stars
One in 4 600 water molecules contains a deuterium atom. If all the deuterium could be extracted from 1 m3 of water and then reacted, how much energy could be obtained? (Each D-D fusion liberates 3.65 MeV of energy, 1 MeV = 1.6 × 10^–13 J, ?water = 103 kg/m3, one mole of water has a mass of 18 g, and NA = 6.02 × 10^23)
a. 4.2E+12 J b. 1.3E+25 J c. 3.5E+11 J d. 2.1E+12 J e. 6.9E+14 J
Assuming the frequency remains constant, a monochromatic light ray is transmitted through an glass-to-air boundary, what happens to the wavelength?
a. decreases b. approaches zero value c. increases d. remains unchanged
The acceleration of a ball as it rolls down a ramp is 4 m/s2 . The ball is referred to 2 s after it starts to roll. A racecar goes around a 200 m radius curve at a constant speed of 40 m/s. Its acceleration is 8 m/s2
Indicate whether the statement is true or false