An inductor has a current I = 0.5A cos[( 275 s-1 ) t] . The maximum emf across the inductor is equal to 0.5 V. What is the self-inductance of the inductor?
A)
4.37 mH
B)
3.64 mH
C)
2.75 mH
D)
0.73 mH
E)
1.43 mH
B
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The most recent ice age ended
A) about 1000 years ago. B) about 10,000 years ago. C) about 100,000 years ago. D) about one million years ago. E) hundreds of millions of years ago.
A person looks horizontally at the edge of a swimming pool. If its length is 5 m, and the pool is filled to the surface, to what depth (in m) could the observer see? (n for water is 1.33)
a. 3.2 b. 4.4 c. 2.1 d. 1.0 e. 0.3
A diffraction grating has 6 700 lines/cm. What is the slit separation?
a. 6.7E–3 m b. 1.5E–6 m c. 1.5E–9 m d. 6.7E–7 m e. Not enough information
The diagram below shows a cross section of the interior of Uranus. Which of the regions do current computer models suggest is composed primarily of liquid water? The lowest pressure regions will be gaseous
a.
region 1
b.
region 2
c.
region 3
d.
all of the regions
e.
none of the regions