Upon what data do measurements of sizes of eclipsing binaries depend?
A) their orbital periods and separations
B) their masses and luminosities
C) their Doppler shifts and durations of stages of their eclipses
D) their temperatures and speeds
E) their temperatures and masses
C
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Today, the energy resource that supplies the United States with the greatest amount of electricity is
A) oil. B) coal. C) nuclear. D) hydroelectric. E) natural gas.
The kinetic energy of an object:
a. is inversely proportional to its speed. b. is directly proportional to its speed. c. sometimes increases with increasing speed and sometimes decreases. d. is directly proportional to the square of its speed. e. is inversely proportional to the square of its speed.
A steel bar of rectangular cross section (a 5 38 mm, b 5 50 mm) carries a tensile load P. The allowable stresses in tension and shear are 100 MPa and 48 MPa, respectively. The maximum permissible load Pmax is approximately:
(A) 56 kN
(B) 62 kN
(C) 74 kN
(D) 91 kN
Why does a July day in the Gulf of Mexico generally feel appreciably hotter than a July day in Arizona?
What will be an ideal response?