Striations are long parallel scratches in
A) glaciers that show flow direction.
B) bedrock that show the direction of the glaciers flow.
C) bedrock that form next to roches moutonnées.
D) bedrock that show outwash flow direction.
Answer: B
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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
Three identical springs each have the same spring constant k. If these three springs are attached end to end forming a spring three times the length of one of the original springs, what will be the spring constant of the combination?
a. k b. 3k c. k/3 d. 1.73k
Calculate the intensity level in dB of a sound wave that has an intensity of 15 × 10^?4 W/m2
a. 20 b. 200 c. 92 d. 9 e. 10
The radius of the n = 3 Bohr orbit in the hydrogen atom is
A) 0.36 nm. B) 0.60 nm. C) 0.48 nm. D) 0.12 nm. E) 0.24 nm.