NASA is giving serious consideration to the concept of solar sailing. A solar sailcraft uses a large, low-mass sail and the energy and momentum of sunlight for propulsion. (a) Should the sail be absorbing or reflective? Why? (b) The total power output of the sun is 3.9 * 10^26 W. How large a sail is necessary to propel a 10,000 kg spacecraft against the gravitational force of the sun? Express your result in square kilometers. (c) Explain why your answer to part (b) is independent of the distance from the sun.

Physics for Scientists and Engineers: Foundations and Connections
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Author:Katz, Debora M.
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NASA is giving serious consideration to the
concept of solar sailing. A solar sailcraft uses a large, low-mass sail and
the energy and momentum of sunlight for propulsion. (a) Should the sail
be absorbing or reflective? Why? (b) The total power output of the sun
is 3.9 * 10^26 W. How large a sail is necessary to propel a 10,000 kg
spacecraft against the gravitational force of the sun? Express your result
in square kilometers. (c) Explain why your answer to part (b) is independent
of the distance from the sun.

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