An airplane is traveling at 250 m/s in level flight. If the airplane is to make a change in direction, it must travel is a horizontal curved path. To fly in the curved path, the pilot banks the airplane at an angle such that the lift has a horizontal component that provides the horizontal centripetal acceleration to move in a horizontal circular path. If the airplane is banked at an angle of 15.0 degrees, then the radius of curvature of the curved path of the airplane is
A. 20.1 km.
B. 23.8 km.
C. 25.0 km.
D. 27.5 km.
E. 30.1 km.
B. 23.8 km.
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In a semiconductor doped with donor atoms, the conduction-band energy is 1.1 eV and the donor energy level is 1.0 eV. At a high temperature there are approximately as many electrons in the conduction band as there are holes in the valence band. For this semiconductor, the Fermi energy is approximately equal to:
(a) 1.1 eV (b) 1.0 eV (c) 1.05 eV (d) 0.55 eV
If the intensity of sound changes (increases) by a factor of 100, the decibel level changes by a factor of
A) log 100. B) 100. C) 20. D) 1. E) 10.
An inductor produces a back emf in a DC series RL circuit when a switch connecting the battery to the circuit is closed. We can explain this by
a. Lenz's law. b. increasing magnetic flux within the coils of the inductor. c. increasing current in the coils of the inductor. d. all of the above. e. only (a) and (c) above.
Under the correct conditions, two light waves can produce regions of reinforcement and regions of cancellation. This phenomenon is known as
A. polarization. B. reflection. C. interference. D. refraction.