A 4.0-mF capacitor is discharged through a 4.0-k? resistor. How long will it take for the capacitor to lose half its initial stored energy?
A) 9.2 s
B) 2.7 s
C) 10.2 s
D) 5.5 s
E) 1.6 s
D
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An object of mass m is attached to string of length L. When it is released from point A, the object oscillates between points A and B. Which statement about the system consisting of the pendulum and the Earth is correct?
a.
The gravitational potential energy of the system is greatest at A and B.
b.
The kinetic energy of mass m is greatest at point O.
c.
The greatest rate of change of momentum occurs at A and B.
d.
All of the above are correct.
e.
Only (a) and (b) above are correct.
Jupiter is largest and brightest in our skies when seen at ________
Fill in the blank(s) with correct word
The point P lies along the perpendicular bisector of the line connecting two long straight wires S and T perpendicular to the page. A set of directions A through H is shown next to the diagram. When the two equal currents in the wires are directed into the page, the direction of the magnetic field at P is closest to the direction of
A. A B. B. C. C. D. D. E. E.
A nitrogen molecule has a diameter of about 0.29 nm. The mean free path of a nitrogen molecule in a tank of dry nitrogen at room temperature and standard pressure is about 0.10 ?m. A tank containing nitrogen at standard temperature and pressure has volume V. If the tank is compressed by means of a piston to 20% of its original volume, what is the mean free path for a nitrogen molecule under the new conditions?
A. 0.089 ?m B. 0.125 ?m C. 0.080 ?m D. 0.112 ?m