Young's Modulus: A bridge piling has a cross-sectional area of 1.250 m2 and supports a load of 1875 N. What is the stress on the column?
A. 1875 N
B. 1875 N/m2
C. 1500 N/m2
D. 2344 N/m2
Answer: C
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Resistance and Resistivity: A wire of resistivity ? must be replaced in a circuit by a wire of the same material but four times as long. If, however, the total resistance is to remain as before, the diameter of the new wire must
A. be the same as the original diameter. B. be one-half the original diameter. C. be one-fourth the original diameter. D. be two times the original diameter. E. be four times the original diameter.
The shape of Earth's magnetosphere is modified by
a. the Moon's tidal force. b. the solar wind. c. Earth's own gravity. d. asymmetries in the shape of Earth's core. e. Earth's elliptical orbit.
What is the name of the point on the celestial sphere that all stars seem to circle around, when viewing the sky from North America?
What will be an ideal response?
The period-luminosity relation is critical in finding distances with
A) Cepheid variables. B) spectroscopic parallaxes. C) pulsars. D) trigonometric parallaxes. E) RR Lyrae stars.