Cold fusion has
a. solved the world's energy crisis.
b. been used to create superheavy elements.
c. been achieved using muons.
d. rendered nuclear reactors obsolete.
b, c
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Nanometer is a unit of _____
A) frequency B) energy C) mass D) length
A CD has a diameter of 12.0 cm. If the CD is rotating at a constant angular speed of 200 revolutions per minute, then the tangential velocity of a point on the circumference is
A. 1.06 m/s. B. 1.26 m/s. C. 1.39 m/s. D. 1.62 m/s. E. 1.32 m/s.
What event made it possible for photons to begin to travel freely through the universe when the universe was about 380,000 years old?
A) Magnetic fields had weakened to the point that they no longer interfered with light. B) The universe had expanded and cooled enough for electrons to combine with nuclei to form neutral atoms. C) Atomic nuclei were finally able to escape the plasma of the early universe. D) Atoms started to combine to make the first molecules. E) Fusion of hydrogen to make helium ceased.
For a mass suspended on a spring in the vertical direction, the time for one complete oscillation will depend on:
a. the value for g (the acceleration due to gravity). b. the distance the mass was originally pulled down. c. the maximum speed of the oscillating mass. d. the time doesn't depend on any of the above.