Glass panes are opaque to a certain type of radiation, which can cause sunburn. What type of radiation is it? This radiation is important in ozone layer reactions
a. gamma
c. X-ray
b. ultraviolet
d. microwave
B
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What is the ratio of the light-gathering power of a 10-m telescope to that of a 1-m telescope?
a. 10 to 1 b. 1 to 10 c. 100 to 1 d. 1 to 100 e. 3.2 to 1
A 2,000 kg car traveling at 30.0 mi/h skids to a stop in 60.0 meters. The force of friction during the skid is (1.0 mi/h = 0.447 m/s)
A. 4,500 N. B. 4,200 N. C. 3,750 N. D. 3,000 N. E. 2,400 N.
Which of the following describes tectonics?
A) the excavation of bowl-shaped depressions by asteroids or comets striking a planet's surface B) the eruption of molten rock from a planet's interior to its surface C) the disruption of a planet's surface by internal stresses D) the wearing down or building up of geological features by wind, water, ice, and other phenomena of planetary weather
Series/Parallel Circuits: If 1.5 A flows through R2, what is the emf V of the ideal battery in the figure?
A. 150 V B. 75 V C. 60 V D. 30 V