From what you know about astronomical units and light-years, how would you define a light-minute?
What will be an ideal response?
A light-minute is the distance light travels in a minute, or (3.0 × 10^8 m)(60 s) = 18 × 10^6 km.
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The least massive main-sequence stars have a/an _____ luminosity class and a/an _____ spectral class
Fill in the blank(s) with correct word
The intensity of radiation reaching the Earth from the Sun is 1350 W/m2. The Earth's radius is 6.4 × 106 m. How big a force does this radiation exert on the Earth? (Assume it is all absorbed.)
A. 5.8 × 108 N B. 1.2 × 109 N C. 2.3 × 109 N D. 4.6 × 109 N E. 1.7 × 1017 N
A double-convex thin lens has radii of curvature of magnitude 46 cm, and it is made of glass of index of refraction 1.60. What is the focal length of this lens?
A) infinite B) -30 cm C) 18 cm D) 38 cm E) -19 cm
A series RLC circuit has a 100-? resistor, 2.0-mH inductor and a 4.0-?F capacitor connected across a 120-V rms ac source at 1000/? Hz. What is the power factor of this circuit?
A) 0.54 B) 0.94 C) 0.64 D) 0.84 E) 0.74