In case-hardening, carbon is diffused into low-carbon iron to produce a hard surface layer that resists wear and deformation. At a temperature of 600°C it is observed that the hardened surface layer extends 0.001 meter into the surface of the iron after exposure to carbon for two hours. It is desired to have the hardened surface layer extend 0.002 meters into the iron. At 600°C how many hours of carburizing are required?
What will be an ideal response?
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A comet has an elliptical orbit around the Sun. Its total orbital energy is
A) greatest when it is farthest from the Sun. B) greatest when it is closest to the Sun. C) the same throughout its orbit.
How can we determine the reflectivity of an asteroid?
A) by taking a photograph of it B) by measuring its mass and radius C) by comparing its brightness in visible light to its brightness in infrared light D) by where it is located in the asteroid belt
____________________ waves are seismic waves that do not travel through Earth's liquid core
Fill in the blank(s) with correct word
Consider the displacement vectors shown below.
a) Which vector (if any) is equal to 
?
(b) Which is not equal to but has the same magnitude?
(c) Which is equal to 
?
(d) Which is equal to 
?