A light bulb, sold as long-lasting, is rated 120 W at 130 V. The "increased" lifetime comes from using it at 120 V. Assuming negligible change in resistance at the different voltage, what is its power consumption at 120 V?
a. 92 W
c. 108 W
b. 102 W
d. 85 W
B
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Banked Curves: A highway curve of radius 100 m, banked at an angle of 45°, may be negotiated without friction at a speed of
A. 22 m/s. B. 31 m/s. C. 44 m/s. D. 67 m/s.
Many meteorites appear to have formed very early in the solar system's history. How do these meteorites support the nebular theory's scenario for the formation of the terrestrial planets?
A) The appearance and composition of these meteorites is just what we'd expect if metal and rock condensed and accreted as the nebular theory suggests. B) The sizes of these meteorites are just what we'd expect if metal and rock condensed and accreted as the nebular theory suggests. C) The overall composition of these meteorites is just what we believe the composition of the solar nebula to have been: mostly hydrogen and helium. D) The appearance and composition of these meteorites matches what we observe in comets today, suggesting that they were once pieces of icy planetesimals.
The centers of two circular loops are separated by a fixed distance. For what relative orientation of the loops is their mutual inductance a maximum
1.coaxial and lying in parallel planes 2.lying in the same plane 3.lying in perpendicular planes, with the center of one on the axis of the other 4.The orientation makes no difference.
A loop of wire is oriented in the magnetic field as shown (the plane of the loop is perpendicular to the direction of the magnetic field and the magnetic field strength increases with height). Which of the following is true? 
A. There will be an induced current only if the loop is moved to the right B. There will be an induced current only if the loop is moved to the left C. There will be an induced current only if the loop is moved upward D. There will be an induced current if the loop is moved either up or down E. There will be an induced current only if the loop is moved downward