To the nearest percent, what fraction of an iceberg is submerged? (?ice = 917 kg/m3, ?sea = 1.03 × 10^3 kg/m3.)
a. 95%
b. 93%
c. 91%
d. 89%
e. 77%
d
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Superposition of waves can occur
a. in transverse waves. b. in longitudinal waves. c. in sinusoidal waves. d. in all of the above. e. only in (a) and (c) above.
For a beam of light, the direction of polarization is defined as
A) the beam's direction of travel. B) the direction of the electric field's vibration. C) the direction of the magnetic field's vibration. D) the direction that is mutually perpendicular to the electric and magnetic field vectors.
The rotation curve of a galaxy can be used to determine
a. the relative number of hot young stars in the galaxy. b. the relative amount of gas and dust in the galaxy. c. the radius of the galaxy. d. the luminosity of the galaxy. e. the mass of the galaxy.
Vector V1 is (5i + 7j - 3k) and V2 = (7i + 2j + 14k). The vector product of these two vectors is:
(A) -104i + 72j - 39k (B) -124i + 62j - 33k (C) 104i - 91j - 39k (D) -114i - 12j + 91k