Measured ages of globular clusters suggests that the Universe is about
a. 1.4 billion years old.
b. 14 billion years old.
c. 140 billion years old.
b
You might also like to view...
In active galaxies, their central engines may be temporarily fed by
A) a sudden surge of star formation. B) a series of supernovae around the core. C) the sudden collapse of the core into a supermassive black hole. D) a close encounter with a neighbor galaxy. E) the fusion of helium into carbon in their cores.
When it comes near a heavy nucleus, a gamma ray, which is a high energy photon, can "disappear," and in its place there will be produced an electron and a positron, which both have mass. This pair production is an example of
a. time dilation. b. length contraction. c. the equivalence of mass and energy. d. the principle of relativity. e. none of the above.
In an observation made in 1919 demonstrating the deflection of starlight due to gravity, light rays moving near ________ bent to a slightly different angle.
A. a laser with the same frequency of light B. the Earth at its equator C. the Sun D. the Moon
A ventilation fan with a moment of inertia of 0.034 kg•m2 has a net torque of 0.14 N•m applied to it. What angular acceleration does it experience?
a. 5.3 rad/s2 c. 3.2 rad/s2 b. 4.1 rad/s2 d. 0.31 rad/s2