A 120-V rms signal at 60 Hz is applied across a 30-mH inductor and a 100-? resistor. What is the rms value of the current in this circuit?
A) 0.80 A
B) 1.2 A
C) 1.4 A
D) 1.6 A
E) 1.8 A
B
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Jupiter's colors come in part from its three layers of clouds. Which of the following is not the primary constituent of one of Jupiter's cloud layers?
A) clouds of sulfuric acid B) clouds of water C) clouds of ammonium hydrosulfide D) clouds of ammonia
A wooden raft has a mass of 55 kg. When empty it floats in water (density with 64% of its volume submerged. What maximum mass of sand can be put on the raft without sinking it?
What will be an ideal response?
The "flatness" problem arises because the curvature of space seems remarkably close to
A) zero curvature, favoring a spherical cosmos. B) exactly one. C) .5, suggesting we are split between open and closed universes. D) 2.73 K, in spite of the eddies and turbulence that led to galaxy formation. E) infinity, suggesting an open universe is the only possible cosmology.
A cantilever beam with rectangular cross section (b 5 95 mm, h 5 300 mm) supports load P 5 160 kN at its free end. The ratio of the magnitudes of the principal stresses (?1/?2) at point A (at distance c 5 0.8 m from the free end and distance d 5 200 mm up from the bottom) is approximately:
(A) 5
(B) 12
(C) 18
(D) 25
