The nearest star system closest to our Sun is about
A) 4 light years away.
B) 20 light years away.
C) 100 light years away.
D) 40,000 light years away.
Answer: A
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The electrical resistivity of tantalum (Ta) at temperatures approaching 0 K is 1×10-8 ?·m, and at 150K it is 7×10-8 ?·m. Analytically predict the electrical resistivity of Ta at 295 K.
What will be an ideal response?
What is the difference between energy and power?
A) Power is the rate at which energy is used, so its units are a unit of energy divided by a unit of time. B) Power is measured in joules and energy is measured in watts. C) Power is used to describe energy of light, whereas the term energy has a broader meaning. D) There's no difference; energy and power are different names for the same thing.
Mesons consist of
A) quark-antiquark pairs. B) triple gluons. C) lepton-antilepton pairs. D) lepton-quark pairs.
At a certain instant the current flowing through a 5.0-H inductor is 3.0 A. If the energy in the inductor at this instant is increasing at a rate of 3.0 J/s, how fast is the current changing?
A) 0.20 A/s B) 0.10 A/s C) 0.80 A/s D) 0.40 A/s