One limit on the age of the Universe is that it must be older than the oldest stars.
Answer the following statement true (T) or false (F)
True
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A very long wire carries a uniform linear charge density of 7.0 nC/m. What is the electric field strength 16.0 m from the center of the wire at a point on the wire's perpendicular bisector? (?0 = 8.85 × 10-12 C2/N ? m2)
A) 7.9 N/C B) 3.9 N/C C) 0.49 N/C D) 0.031 N/C
Polaris has always been the star nearest the north celestial pole
Indicate whether the statement is true or false
What kind of object does a main sequence star become on first using up its core hydrogen?
A. a red giant B. a protostar C. a supernova D. a planetary nebula E. a white dwarf
In terms of thermal expansion it is important that
A) a key and its lock are made of similar or the same material. B) the fillings in your teeth expand at the same rate as teeth. C) iron rods and concrete in which they're embedded expand equally. D) all of the above E) none of the above