In the Grand Unified Theory, the superforce was:
A) only dark energy.
B) a union of the weak and electromagnetic forces.
C) a union of all matter and energy.
D) a union of the gravitational, strong and weak nuclear, and electromagnetic forces.
E) only in effect at low energies.
D
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Besides Earth, which of the terrestrial planets and/or satellites of terrestrial planets show(s) evidence for the possible existence of liquid water flowing on its surface in the past?
a. Venus b. the Moon c. Phobos d. Mars e. None of the terrestrial planets or satellites show such evidence.
Size of the Nucleus: Estimate the radius (in fm) of a radon nucleus that contains 86 protons and 136 neutrons.
Fill in the blank(s) with the appropriate word(s).
How does the resistance of a thick piece of copper wire compare to the resistance of a thin piece of copper wire?
A. The resistance of the thin piece is greater than that of the thick piece. B. The resistance of the thick piece is greater than that of the thin piece. C. Both the wire and narrow piece of copper provide the same resistance.
The short pulses and the discovery of the pulsar in the Crab Nebula are strong evidence that pulsars are _____
A) red dwarfs B) neutron stars C) giant stars D) yellow dwarfs