Estimate the time required to melt a 5-mm sheet of ice on an aircraft wing if the wing surface is heated to 60ºC and the surrounding air is -10ºC. Assume that the average convective heat transfer coefficients are 20 W/m^2? K for the air/ice and 10 W/m^2?K for the ice/melted water.
What will be an ideal response?
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_____________ is a very long and deep canyon on Mars
a. Valles Marineris b. Ishtar Terra c. Tharsis Bulge d. Lobate Scarp e. Phobos
Suppose that a star has twice the surface temperature of the sun and also twice the radius. How many times larger is the rate at which this star emits energy compared to the rate at which the sun emits energy?
A. The star radiates at the same rate as the sun. B. 2 times C. 4 times D. 8 times E. 16 times F. 32 times T. 64 times
What are coronal holes?
A) regions on the photosphere where magnetic lines poke through, creating the cooler areas of the sunspots B) areas of the corona where magnetic field lines project into space, allowing charged particles to escape the Sun, becoming part of the solar wind C) holes in the corona of the Sun that allow us to see the photosphere D) tunnels in the outer layers of the Sun through which photons can escape more quickly than through the radiation zone
Briefly explain how the Sun became hot enough for nuclear fusion.
Fill in the blank(s) with the appropriate word(s).