A tube bank consists of 30 columns of 3 cm diameter tubes, spaced 4.5 cm apart (center to center) in-line both ways. Ethylene glycol at 90ºC is to be cooled to 60ºC after passing over the tube bank at 2 m/s. Estimate the average tube temperature.
What will be an ideal response?
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Which of the following statements best describes the idea behind the Gas Exchange Experiment on board the Viking landers?
A) radioactive gases should be produced when radioactive nutrients are added to a soil sample B) living organisms in the soil should give off gases when they metabolize nutrients C) soil with living organisms in it should contain organic molecules D) living organisms in the soil should incorporate carbon from atmospheric gases
An electron with kinetic energy 2.80 eV encounters a potential barrier of height 4.70 eV. If the barrier width is 0.40 nm, what is the probability that the electron will tunnel through the barrier?
(1 eV = 1.60 × 10-19 J, mel = 9.11 × 10-31 kg, h = 1.055 × 10-34 J ? s, h = 6.626 × 10-34 J ? s) A) 3.5 × 10-3 B) 7.3 × 10-3 C) 1.4 × 10-2 D) 2.9 × 10-3 E) 3.5 × 10-2
An optical fiber having index of refraction 1.40 is clad with a material of index of refraction 1.25. What is the critical angle for this fiber?
A. 63.2
B. 26.8
C. 41.8
D. 73.0
E. 16.5
Which of the following is true according to the hypothesis on chemical evolution?
A) Early living things reproduced by linking and breaking apart at random. B) Reproducing molecules did not originate on Earth but instead arrived from space. C) Somewhere in the oceans, after sufficient time, a molecule formed that could copy itself. D) Due to the effect of ultraviolet radiation, complex organic molecules that were living were formed.