The potential applied to a 20-? resistor is (60 V) cos(33t). What is the average power consumed in the resistor?
What will be an ideal response?
90 W
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A thin uniform film of oil that can be varied in thickness covers a sheet of glass of refractive index 1.52
The refractive index of the oil is 1.64. Light of wavelength 555 nm is shone from air at normal incidence on the film. Starting with no oil on the glass, you gradually increase the thickness of the oil film until the first interference maximum in the reflected light occurs. What is the thickness of the oil film at that instant? A) 139 nm B) 169 nm C) 183 nm D) 84.6 nm E) 91.3 nm
He discovered that the orbits of planets are ellipses
A) Kepler B) Ptolemy C) Galileo D) Tycho Brahe E) Copernicus
Vision Problems: A nearsighted person has a far point of 18 cm. What power contact lenses will allow this person to comfortably see distant objects clearly?
A. +5.6 diopters B. -5.6 diopters C. +0.056 diopters D. -0.056 diopters
What does the Milky Way look like on the night sky?
A. a spiral-shaped region of nebulosity B. a uniform scattering of stars throughout the sky C. a pale band of light scattered with stars that stretches across the sky D. The Milky Way is not visible from Earth without a telescope.