The night sky is dark because the Universe is not infinitely old
a. True
b. False
Indicate whether the statement is true or false
True
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Two point charges, separated by 1.7 cm, have charge values of +2.0 and ?4.0 µC, respectively. Suppose we determine that 50 field lines radiate out from the +2.0-µC charge. If so, what might be inferred about the ?4.0-?C charge with respect to field lines?
a. 25 radiate out b. 100 radiate out c. 100 radiate in d. 50 radiate in e. 50 radiate out
Lenz's law arises because of the following basic principle:
A. Gauss's law B. the conservation of momentum C. Coulomb’s law D. the conservation of energy E. the conservation of charge
The intensity level of an orchestra is 85 dB. A single violin achieves a level of 70 dB. How does the intensity of the sound of the full orchestra compare with that of the violin?
Determine the resistance R when I = 1.5 A
a.
40 ?
b.
8.0 ?
c.
85 ?
d.
28 ?
e.
32 ?