X-rays are blocked by ________ and ________ present in Earth's atmosphere.
A. electric charges; clouds
B. nitrogen; helium
C. water molecules; carbon dioxide
D. ozone; oxygen
Answer: D
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Buoyancy: A 200-N object floats with three-fourths of its volume beneath the surface of the water. What is the buoyant force on the object? The density of water is 1000 kg/m3.
A. 50 N B. 150 N C. 200 N D. 267 N E. It cannot be determined because we do not know the volume of the object.
Meters: Decreasing the resistance of an ammeter's shunt resistance
A. allows it to measure a larger current at full scale deflection. B. allows it to measure a smaller current at full scale deflection. C. enables more current to pass directly through the galvanometer. D. converts it to a voltmeter.
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Which four moons are believed to have large bodies of liquid water?
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