_____ is proposed dark matter made up of particles other than protons and neutrons
A) Baryonic matter
B) Biotic matter
C) Nonbaryonic matter
D) Abiotic matter
C
You might also like to view...
A primary difference between momentum and kinetic energy is
A) momenta can cancel; kinetic energy cannot. B) kinetic energy can cancel; momenta cannot. C) either of the above depending on circumstances D) none of the above
A split highway has a number of lanes for traffic. For traffic going in one direction, the radius for the inside of the curve is half the radius for the outside. One car, car A, travels on the inside while another car of equal mass, car B, travels at equal speed on the outside of the curve. Which statement about resultant forces on the cars is correct?
A. The force on A is half the force on B. B. The force on B is half the force on A. C. The force on A is four times the force on B. D. The force on B is four times the force on A. E. There is no net resultant force on either as long as they stay on the road while turning.
A +15-nC point charge is placed on the x axis at x = 1.5 m, and a -20-nC charge is placed on the y axis at y = -2.0m. What is the magnitude of the electric field at the origin?
a. 105 N/C b. 15 N/C c. 75 N/C d. 45 N/C e. 60 N/C
The rest energy of an electron and its antiparticle, a positron, is 0.511 MeV. In order to produce an electron-positron pair, a gamma ray must have an energy larger than 1.022 MeV because of
a. time dilation b. length contraction c. the equivalence of mass and energy d. the principle of relativity e. none of the above