The atomic nucleus contains
A) yogurt.
B) protons only.
C) neutrons and electrons.
D) protons and neutrons.
E) protons and electrons.
D
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The theory that the collapse of a massive star's iron core produces neutrinos was supported by
a. the size and structure of the Crab nebula. b. laboratory measurements of the mass of the neutrino. c. the brightening of supernovae a few days after they are first visible d. underground counts from solar neutrinos. e. the detection of neutrinos from the supernova of 1987.
How have scientists been able to determine that Earth has a liquid metal outer core?
What will be an ideal response?
Which of the following statements about the rings of the four jovian planets is not true?
A) All rings lie within two to three planetary radii of their planet. B) All the particle orbits are fairly circular and near their planet's equatorial plane. C) All have gaps and ringlets. D) All probably look much the same as they did when the solar system first formed. E) All are made of individual particles of rock or ice that orbit in accord with Kepler's laws: inner ring particles orbiting faster, and outer ring particles orbiting slower.
Which is not an example of approximate simple harmonic motion?
a. A ball bouncing on the floor. b. A child swinging on a swing. c. A piano string that has been struck. d. A car's radio antenna as it waves back and forth.