Which plate boundary has the lowest earthquake frequency?
Answer: Divergent boundaries
Rationale:
The warm rocks located at divergent boundaries have a lower rigidity. They do not build up as much stress as rocks at other locations before deforming
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A cantilever beam with rectangular cross section (b 5 95 mm, h 5 300 mm) supports load P 5 160 kN at its free end. The ratio of the magnitudes of the principal stresses (?1/?2) at point A (at distance c 5 0.8 m from the free end and distance d 5 200 mm up from the bottom) is approximately:
(A) 5
(B) 12
(C) 18
(D) 25
Solar-type stars in our galaxy are
A) very common, making up about 50% of the total B) very rare (less than 1%) C) fairly common (several percent) D) the most common type of stars in our galaxy (75% or more)
All of the following are involved in carrying energy outward from a star's core except
A) convection. B) radiative diffusion. C) conduction. D) neutrinos.
Use the appropriate relativity formula given in the text to answer the following. Isabella is moving by you at a speed of 0.8c. Although 1 minute passes on your watch, how much time will you see pass on her watch?
A) 36 seconds B) 1 minute C) 48 seconds D) 100 seconds