A positively charged particle has a velocity in the negative z direction at point P. The magnetic force on the particle at this point is in the negative y direction. Which one of the following statements about the magnetic field at point P can be determined from this data?
a. Bx is positive.
b. Bz is positive.
c. By is negative.
d. By is positive.
e. Bx is negative.
a
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How were the maria formed?
A. Maria were formed by ancient oceans on the Moon's surface. B. Maria formed from ash falls from long dead volcanoes. C. They were formed by the huge tidal interaction between Earth and Moon. D. Successive volcanic eruptions flooded huge basins formed by large impacts.
Suppose that a heavy person and a light person are balanced on a teeter-totter made of a plank of wood. Each person now moves in toward the fulcrum a distance of 25 cm. What effect will this have on the balance of the teeter-totter?
A) The teeter-totter will remain in balance. B) The heavy person's end will go down. C) The light person's end will go down. D) One cannot tell whether either end will rise or fall without knowing the relative mass of the plank. E) Only if the plank has significant mass will the light person's end go down.
Which of the following ions is isoelectronic with an argon atom?
a. Cl- b. Na+ c. F- d. S2+
A photon with an energy of E? = 2.090 0 GeV creates a proton-antiproton pair in which the proton has a kinetic energy of 95.0 MeV. What is the kinetic energy of the antiproton? (mpc2 = 938.3 MeV)