In the "special theory of relativity," what does the word "special" refer to?
A) This theory is restricted to the study of light beams.
B) This theory is restricted to the study of gravitational forces.
C) This theory is restricted to the observations of stationary observers.
D) This theory is restricted to the observations of accelerated observers.
E) This theory is restricted to the observations of non-accelerated observers.
E
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What are the smaller parts of a proton?
A.) Two down quarks and an up quark. B.) Two electrons and a neutron. C.) A strange quark, a down quark, and a charm quark. D.) An up quark and a down quark. E.) Two up quarks and a down quark.
Satellites in low-Earth orbits are more likely to crash to Earth when the sunspot cycle is near solar maximum because
A) it is too dangerous to send the Space Shuttle to service satellites during solar maximum. B) Earth's upper atmosphere tends to expand during solar maximum, exerting drag on satellites in low orbits. C) of increased magnetic interference. D) they are more likely to have their electronics "fried" by a solar flare during solar maximum.
The optimal exercise frequency for improving one's health related cardiorespiratory fitness level is three to five days per week.
Indicate whether the statement is true or false.
If a surface has a work function of 1.5 eV and photons of energy 2.7 eV are shone on the surface, what is a possible kinetic energy of the electrons emitted from the surface?
A) 3.0 eV B) 2.0 eV C) 4.0 eV D) 1.0 eV E) No electrons are emitted.