Atmospheric molecules do not fly off into outer space due to
A) their chaotic speeds.
B) their relatively low densities.
C) Earth gravitation.
D) cohesive forces.
Answer: C
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When a wheel is rolling without slipping, the magnitude of its velocity relative to the ground is greatest at
A. the point in contact with the ground. B. the point at the center of the wheel. C. the point at the top of the wheel opposite to the point in contact with the ground. D. the point farthest forward from the center of mass of the wheel. E. the point farthest behind the center of mass of the wheel.
Can the lines in the figure below be equipotential lines?
a.
No, because there are sharp corners.
b.
No, because they are isolated lines.
c.
Yes, because any lines within a charge distribution are equipotential lines.
d.
Yes, they might be boundary lines of the two surfaces of a conductor.
e.
It is not possible to say without further information.
A 4.00 kg object is moving at 5.00 m/s EAST. It strikes a 5.00 kg that is moving WEST at 2.00 m/s. The objects have a one-dimensional elastic collision in the EAST-WEST direction. The velocity of the 5.00 kg object after the collision is
A. 4.22 m/s EAST. B. 2.78 m/s WEST. C. 4.22 m/s WEST. D. 2.78 m/s EAST. E. 1.11 m/s WEST.
Show that in the limit ?x ? 0, the difference equation for one-dimensional steady conduction with heat generation,is equivalent to the differential equation.
GIVEN • One dimensional steady conduction with heat generation SHOW (a) In the limit of small ?x, the difference equation is equivalent to the differential equation