Two long parallel wires are separated by 4.0 cm. One of the wires carries a current of 20 A and the other carries a 30-A current. Determine the magnitude of the magnetic force on a 2.0-m length of the wire carrying the greater current
a. 7.0 mN
b. 6.0 mN
c. 8.0 mN
d. 9.0 mN
e. 4.0 mN
b
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The sketch shows groups of stars on the H-R diagram, labeled (a) through (e); note that (a) represents the entire main sequence, while (c) and (d) represent only small parts of the main sequence. Which group represents the most common type of stars?
A) b B) c C) d D) e
A superconducting magnet uses
A) iron cores. B) superconducting coils. C) both of these D) neither of these
A 75-kg swimmer dives horizontally off a 500-kg raft. The diver's speed immediately after leaving the raft is 1.6 m/s. A micro–sensor system attached to the edge of the raft measures the time interval during which the diver applies an impulse to the raft just prior to leaving the raft surface. If the time interval is read as 0.20 s, what is the magnitude of the average horizontal force by diver
on the raft? a. 900 N c. 600 N b. 450 N d. 1500 N
An I/O psychologist interested in measuring performance decides to use supervisor ratings. Supervisor ratings are an example of a(n):
A) composite criterion. B) objective criterion. C) ultimate criterion. D) actual criterion.