The basic function of an automobile's carburetor is to atomize the gasoline and mix it with air to promote rapid combustion. Assume that 40 cm3 of gasoline is atomized into N spherical droplets. Each droplet has a radius of 2.0 × 10^-5 m. Find the total surface area of these N spherical droplets
a. 60,000 cm2
c. 20,000 cm2
b. 24,000 cm2
d. 2800 cm2
A
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A 30-year-old astronaut goes off on a long-term mission in a spacecraft that travels at speeds close to that of light
The mission lasts exactly 20 years as measured on Earth. Biologically speaking, at the end of the mission, the astronaut's age would be A) exactly 50 years. B) exactly 25 years. C) less than 50 years. D) more than 50 years. E) exactly 30 years.
Refer to Figure 10-16 as a particular arrangement for a cooling coil of an air conditioning system. If water condensate from the humid air passing around the vertical tubes is 20 g/s evenly distributed over the 12 tubes, determine the Reynolds number that describes the condensate flow down the tubes. Then estimate the convective heat transfer coefficient and the heat transfer in watts.
What will be an ideal response?
The rapid rotation in the outer disk suggests that our galaxy is more massive than previously thought
Indicate whether the statement is true or false
The Hubble Space Telescope
a. has a flawed primary mirror b. has been repaired c. has failed d. none of the above