How could you test an ore sample for radioactivity?
Use the Geiger tube and detector equipment used in this experiment.
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What fraction of the mass needed to halt expansion is known to exist in the form of visible mass in the universe?
A) 1 percent B) 4 percent C) 22 percent D) 74 percent E) 100 percent
Glycerin at 30 
has a density of 1,260 
and a viscosity of 0.630 Pa-s. The glycerin is poured through a funnel with a neck that is 10.0 cm long and 1.00 cm in diameter. If the level of glycerin is kept at a level 5.00 cm above the neck, then what is the flow rate of the glycerin through the funnel?
A. 
B. 
C. 
D. 
E. 
Galileo's observation of sunspots showed that ________.
A. planets moved along elliptical orbits around the Sun B. the Sun was not a flawless sphere C. the stars could change D. Earth revolved around the Sun E. None of these choices is correct.
Why is the sky blue (on Earth)?
A) because the Sun emits mostly blue light B) because molecules scatter red light more effectively than blue light C) because deep space is blue in color D) because molecules scatter blue light more effectively than red light E) No one knows—this is one of the great mysteries of science.