One long wire carries a current of 30 A along the entire x axis. A second long wire carries a current of 40 A perpendicular to the xy plane and passes through the point (0, 4, 0) m. What is the magnitude of the resulting magnetic field at the point y = 2.0 m on the y axis?
a. 4.0 ?T
b. 5.0 ?T
c. 3.0 ?T
d. 7.0 ?T
e. 1.0 ?T
b
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How does a red giant compare to a main-sequence star of the same mass?
A) The red giant has higher surface temperature and higher luminosity. B) The red giant has higher luminosity but lower surface temperature. C) The red giant has lower surface temperature and lower luminosity. D) The red giant lower luminosity but higher surface temperature. E) Both stars have the same mass and therefore have the same surface temperature and luminosity.
A monochromatic (single frequency, single wavelength) light ray in air (n = 1) enters a glass prism (n = 1.5). In the glass prism
a. both the frequency and the wavelength are the same as in air b. the frequency is the same, but the wavelength is greater than in air. c. the frequency is the same, but the wavelength is smaller than in air. d. the wavelength is the same, but the frequency is greater than in air. e. the wavelength is the same, but the frequency is smaller than in air.
Forces and couples are applied to ABCDE as shown in the figure. All turns of ABCDE are 90o angles. The statically equivalent moment at A (MA) for the force2couple system is (in N?m)
(A) 2160i 1 575j 1 1480k
(B) 160i 1 425j 1 1380k
(C) 2160i 1 325j 1 1380k
(D) 2160i 1 325j 2 1480k
A design requires a material to operate at normal atmospheric temperatures, be subjected to small applied forces, and have a low density and a low cost. Which of the following materials is most likely to best satisfy the design requirements?
(a) Alumina ceramic (b) Carbon steel (c) Polyethylene (d) Graphite-reinforced-epoxy composite