Possible equations (choose the correct one): ? =10^12/H; H=v/d. If gravity is unimportant and H equals 75 km/s/Mpc, then the age of the universe is about
a. 8.9 billion years.
b. 13 billion years.
c. 16.6 billion years.
d. 26 billion years.
e. 74 billion years.
b
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An important factor in producing and controlling a fission chain reaction is the fact that _________ neutrons are much better a causing fission in uranium-235
Fill in the blank(s) with correct word
The postulate(s) of special are (is)
A. the speed of light is the same in all inertial reference frames. B. E0= mc2. C. the principle of conservation of momentum is true. D. the laws of physics are the same in all inertial reference frames. E. the principle of conservation of energy is true.
Which of the following paraphrases Hubble's Law?
A) The faster the galaxy spins, the more massive and luminous it is. B) The greater the distance to a galaxy, the greater its redshift. C) The greater the distance to a galaxy, the fainter it is. D) The more distant a galaxy is, the younger it appears. E) The older the galaxy appears to us, the more luminous it is.
A ball drops some distance and loses 30 J of gravitational potential energy. Do not ignore air resistance. How much kinetic energy did the ball gain?
A) more than 30 J B) exactly 30 J C) less than 30 J D) Cannot be determined from the information given.