A charged particle moving perpendicular to a magnetic field has a magnet force on it. But when an observer moves with the particle, so that the particle has a relative velocity of zero with respect to the observer, one would expect there would be no magnetic force. Yet there is still a force. If it is not a magnetic force, then what is the source of this force?
a. It is an electrical force.
b. It is due to the ether.
c. It is a gravitational force.
d. It is something other than any of the above.
a
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The Kepler mission discovered thousands of stars by using
A) the transit method. B) the Doppler method. C) the astrometric method. D) direct detection. E) gravitational lensing.
State the physical characteristics of the three types of radiation from radioactive sources
Saturn’s average density is less than water’s. Suppose Saturn were placed on a much larger planet made entirely of water. What would happen?
a. It would float. b. It would sink to the center of the water planet. c. It would be spread out due to the rotation of the water planet. d. It would merge into the water planet; denser materials sinking toward the core and lighter materials forming part of the atmosphere. e. There would be a devastating impact and Saturn would be torn apart to form a giant ring system around the water planet.
Equal volumes of hydrogen and helium gas are at the same pressure. The atomic mass of helium is four times that of hydrogen. If the total mass of both gases is the same, the ratio of the temperature of helium (He) to that of hydrogen (H2) is
A.
.B.
.C.
D.
E.