Phil stands at rest with both feet on a scale that reads 500 N. After he gently lifts one foot, the scale reads
A) less than 500 N.
B) 500 N.
C) more than 500 N.
Answer: B
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A negatively-charged particle is slowly moving as it enters a region that has a constant magnetic field. If the velocity of the particle is initially perpendicular to the magnetic field, what will be the subsequent motion of the particle?
a) It will follow a helical path around the magnetic field lines. b) It will follow a circular path in the plane perpendicular to the magnetic field lines. c) It will follow a straight line path in the same direction as it was initially traveling. d) It will follow a circular path in a plane parallel to the magnetic field lines. e) It is impossible to predict the path the particle will follow.
The absolute magnitude of a star is how bright it appears if viewed from a distance of ________ light-years
Fill in the blank(s) with correct word
Based on the observed amount of deuterium in the universe, we can conclude that
A) neutrons outnumber protons 7 to 1 in the universe. B) most of the deuterium that was created during the era of nucleosynthesis has since been destroyed. C) we live in a critical-density universe. D) the density of ordinary (baryonic) matter is about 5 percent of the critical density. E) ordinary (baryonic) matter makes 75 percent of the mass of the universe.
PVC that is _________has an increased elongation to failure relative to that of rigid PVC.
Fill in the blank(s) with the appropriate word(s).