A series LR circuit dissipates 60 W. The circuit is powered by a 120 V rms 60 Hz supply. If the current is 2.0 A rms, what is the phase constant?
A. 14
B. 25
C. 60
D. 70
E. 76
E. 76
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Current searches for extraterrestrial intelligence use radio telescopes at wavelengths
a. which must be shorter than the local wavelengths emitted by Earth's atmosphere. b. which must be longer than the radio wavelength ‘noise' naturally emitted by our galaxy. c. which must be longer than the local wavelengths emitted by Earth's atmosphere and which must be shorter than the radio wavelength ‘noise' naturally emitted by our galaxy. d. Wrong! Visual light wavelengths are used because radio waves are blocked by dust between the stars.
Projectile Motion: A boulder rolls off of a very high cliff and experiences no significant air resistance. While it is falling, its trajectory is never truly vertical.
A. True B. False
Magnification can be accomplished with a hologram when viewed with light that has a
A) longer wavelength than the original light. B) shorter wavelength than the original light. C) neither for holograms cannot be magnified.
Kelli examines her new ruby ring with the jeweler's "loop". The ruby appears 7.0 times larger. If her near point is 35. cm, what is the focal length of the lens?
A) 36. mm B) 70. mm C) 67. mm D) 42. mm E) 58 mm