A rectangular loop of wire measures 1.0 m by 1.0 cm. If a 7.0-A current flows through the wire, what is the magnitude of the magnetic force on the centermost 1.0-cm segment of the 1.0-m side of the loop? (?0 = 4? × 10-7 T • m/
A)
A) 9.8 × 10-6 N
B) 7.8 × 10-7 N
C) 9.8 × 10-8 N
D) 4.9 × 10-6 N
A
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What happens if nearly saturated air experiences a quick, significant temperature drop?
A) Relative humidity drops. B) Relative humidity rises. C) Condensation occurs. D) Outcome depends on the temperature of the air.
Which of the following is true of ancient astronomers?
A) They believed that each star could be part of only one constellation. B) They believed that the sky was a great sphere surrounding Earth. C) They believed that Earth revolved around the Sun. D) They believed that stars were scattered through space at different distances.
A nonprismatic cantilever bar has an internal cylindrical hole of diameter d/2 from 0 to x, so the net area of the cross section for Segment 1 is (3/4)A. Load P is applied at x, and load 2P/2 is applied at x 5 L. Assume that E is constant. The length of the hollow segment, x, required to obtain axial displacement ? 5 PL/EA at the free end is:
(A) x 5 L/5
(B) x 5 L/4
(C) x 5 L/3
(D) x 5 3L/5
In the H-R diagram, stars of luminosity class A1 are located near the center.
Answer the following statement true (T) or false (F)