What feature(s) of this spectrum indicate(s) that Mars appears red in color?
A) the wavelength of the peak labeled 3
B) the wavelength of the peak labeled 6
C) the fact that the intensity of region 4 is higher than that of region 2
D) the fact that the peak labeled 3 is higher than the peak labeled 6
C) the fact that the intensity of region 4 is higher than that of region 2
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If the diameter of a wire increases, its resistance
a. increases. b. decreases. c. does not change. d. will increase or decrease depending on the composition. e. will change in a way that can not be determined.
A rectangular plate (a 5 120 mm, b 5 160 mm) is subjected to compressive stress ?x 5 24.5 MPa and tensile stress ?y 5 15 MPa. The ratio of the normal stress acting perpendicular to the weld to the shear stress acting along the weld is approximately:
(A) 0.27
(B) 0.54
(C) 0.85
(D) 1.22
Suppose you measure the density (mass per volume) of an object moving by you at high speed. How will its density compare to the density it would have at rest in your reference frame?
A) Its density would be higher. B) Its density would be lower. C) Its density would be the same. D) There is no way to know because relativity doesn't tell us anything about density.
Eleven molecules have speeds 16, 17, 18, . . . , 26 m/s. Calculate the root-mean-square of this group of molecules
A) 21.2 m/s B) 21.0 m/s C) 21.5 m/s D) 21.7 m/s