When a switch is closed, completing an LR series circuit, the time needed for the current to reach one half its maximum value is ____ time constants
a. 0.250
b. 0.500
c. 0.693
d. 1.00
e. 1.44
c
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A plane is moving due north, directly towards its destination. Its airspeed is 220 mph. A constant breeze is blowing from west to east at 50 mph. How long will it take for the plane to travel 220 miles north?
a. one hour b. more than one hour c. less than one hour d. more information is needed e. none of the above
Exclusion Principle: Which one of the following is the correct electronic configuration for carbon, which has 6 electrons?
A. 1s2 2s2 2p2 B. 1s1 2p1 C. 1s1 2s2 2p1 D. 1s1 2s1 2p1 E. 1s2 2s2 2p4
Astronomers have found evidence that the expansion of the Universe is accelerating. Such acceleration
A. is deduced because distant galaxies are receding faster than expected from the Hubble law. B. was predicted by the Big Bang model in cosmology. C. is evidence for a cosmic repulsion related to the cosmological constant of relativity theory. D. is deduced because nearby galaxies are receding faster than expected from the Hubble law.
A point charge Q1 = +6.0 nC is at the point (0.30 m, 0.00 m); a charge Q2 = -1.0 nC is at (0.00 m, 0.10 m), and a charge Q3 = +5.0 nC is at (0.00 m, 0.00 m)
What are the magnitude and direction of the net force on the +5.0-nC charge due to the other two charges? (k = 1/4??0 = 9.0 × 109 N ? m2/C2 )