A proton, moving north, enters a magnetic field. Because of this field, the proton curves downward. We may conclude that the magnetic field must have a component
A) downward.
B) towards the east.
C) towards the west.
D) upward.
E) towards the north.
B
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The sketch shows groups of stars on the H-R diagram, labeled (a) through (e); note that (a) represents the entire main sequence, while (c) and (d) represent only small parts of the main sequence. Which group represents stars that have no ongoing nuclear fusion?
A) a B) b C) c D) d E) e
A 0.500-kg ball traveling horizontally on a frictionless surface approaches a very massive stone at 20.0 m/s perpendicular to wall and rebounds with 70.0% of its initial kinetic energy
What is the magnitude of the change in momentum of the stone? A) 18.4 kg ? m/s B) 14.0 kg ? m/s C) 3.00 kg ? m/s D) 1.63 kg ? m/s E) 0.000 kg ? m/s
A ball bearing rolls along a smooth horizontal tabletop, and crashes head-on into a second ball bearing of half its mass. If both ball bearings roll in the x-direction only (either positive or negative) and the initially stationary ball bearing is observed to have a velocity of +2.4 m/s after the collision, what was the velocity of the first ball bearing after the collision?
A. -2.4 m/s B. +2.4 m/s C. -1.2 m/s D. +1.2 m/s E. -0.6 m/s F. +0.6 m/s
Which is not a force?
a. gravity b. electrical force c. voltage d. friction