When the Sun ejects its outer layer into space to become a planetary nebula, most likely the
A) Earth will be ejected from the solar system
B) Earth will be destroyed
C) Earth's oceans will freeze solid
D) Earth will experience a runaway greenhouse effect followed by the total loss of its atmosphere
B
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A cylindrical tank is assembled by welding steel sections in a helical pattern with angle ? 5 50°. Tank diameter is 1.6 m, thickness is 20 mm, and internal pressure is 2.75 MPa. Modulus E 5 210 GPa and Poisson’s ratio ? 5 0.28. The longitudinal strain in the the wall of the tank is approximately:
(A) 1.2 3 1024
(B) 2.4 3 1024
(C) 3.1 3 1024
(D) 4.3 3 1024
The electric fields arriving at a point P from three coherent sources are described by E1 = E0 sin ?t, E2 = E0 sin (?t + ?/4) and E3 = E0 sin (?t + ?/2). Assume the resultant field is represented by Ep = ER sin (?t + ?). The amplitude of the resultant wave at P is
A. E0. B. 1.5E0. C. 1.7E0. D. 2.4E0. E. 2.9E0.
An Earth satellite is orbiting at a distance from the Earth's surface equal to two Earth radii. At this location, the acceleration due to gravity is what factor times the value of g at the Earth's surface?
a. There is no acceleration since the satellite is in orbit. b. 1/9 c. 1/4 d. The answer is not given.
The Ekman transport spiral is driven
A) by density differences in the water column. B) by gravity. C) solely by the Coriolis force. D) by the wind.