Predict/Explain On reentry, the space shuttle’s protective heat tiles become extremely hot. (a) Is the mechanical energy of the shuttle-Earth system when the shuttle lands greater than, less than, or the same as when it is in orbit? (b) Choose the best explanation from among the following:
I. Dropping out of orbit increases the mechanical energy of the shuttle.
II. Gravity is a conservative force.
III. A portion of the mechanical energy has been converted to heat energy.
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