A star's spectral type can be used to determine its
A) mass.
B) surface temperature.
C) luminosity.
D) core temperature.
E) radius.
B) surface temperature.
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The critical part of the atmosphere for protecting life on the ground from excessive ultraviolet radiation is the:
A) hydrosphere. B) troposphere. C) ozone layer. D) stratosphere. E) ionosphere.
7.0 kg is hung from a steel wire of diameter 0.75 mm and length 2.5 meters. (S = 8.2 × 1010 N/m2; Y = 20 × 1010 N/m2)
(a) By how much does the wire stretch? (b) If the wire diameter were doubled, what would be the stretch?
An ornament of mass 40.0 g is attached to a vertical ideal spring with a force constant (spring constant) of 20.0 N/m. The ornament is then lowered very slowly until the spring stops stretching. How much does the spring stretch?
A) 0.00200 m B) 0.0196 m C) 0.0816 m D) 0.800 m E) 0.200 m
Suppose you have three identical lightbulbs, some wire, and a battery. You connect one lightbulb to the battery and take note of its brightness. You add a second lightbulb, connecting it in series with the previous lightbulbs, and again take note of the brightness. Repeat the process with the third lightbulb, connecting it in series with the other two. As the lightbulbs are added, the individual
currents in the lightbulbs (neglect the battery’s internal resistance) 1.increases. 2.decreases. 3.remains the same. 4.Need more information.