A jogger runs halfway around a circular path with a radius of 70 m. What, respectively, are the magnitude of the displacement and the distance jogged?
a. 70 m, 220 m
c. 140 m, 220 m
b. 70 m, 440 m
d. 140 m, 440 m
C
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A steam line is insulated with 15 cm of rock wool. The steam line is a 5 cm OD iron pipe with a 5 mm thick wall. Estimate the heat loss through the pipe per meter length if steam at 120ºC is in the line and the surrounding temperature is 20ºC. Also determine the temperature distribution through the pipe and insulation.
What will be an ideal response?
Propped cantilever beam AB has moment M1 applied at joint B. Framework ABC has moment M2 applied at C. Both structures have con-stant flexural rigidity EI. If the ratio of the applied moments M1/M2 5 3/2, the ratio of the joint rotations at B, ?B1/?B2, is approximately:
(A) 1
(B) 3/2
(C) 2
(D) 5/2
Of the many possible nucleotides, the DNA used in living organisms on Earth uses how many?
A) 20 B) 4 C) 5 D) 23
The electric current in a copper wire is normally composed of
A) electrons. B) protons. C) ions. D) all of the above