The farthest bright galaxies that modern telescopes are capable of seeing are up to
A) 10 billion light years away.
B) 10 million light years away.
C) 1 trillion light years away.
D) 1 million light years away.
E) 1 billion light years away.
A
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A 14,000-kg boxcar is coasting at 1.50 m/s along a horizontal track when it suddenly hits and couples with a stationary 10,000-kg boxcar
What is the speed of the cars just after the collision?
Which of the following statements about neutrinos is true?
A) Neutrinos can be attracted or repelled by electrically charged particles. B) Neutrinos have a mass that is much larger than the mass of an electron. C) Neutrinos respond to the strong nuclear force. D) There are three types of neutrinos, and these represent three of the six known types of lepton. E) Neutrinos respond to the force of gravity.
Which is a possible value for the principal quantum number n?
a. 3.14 b. 7 c. 2.5 d. None of these
A certain ac signal at 1000 Hz is applied across an inductor and a 100-? resistor. If the power factor of the circuit is 0.400, what is the impedance of this circuit?
A) 150 ? B) 200 ? C) 250 ? D) 100 ? E) 300 ?