ch05-p061 - 61. The forces on the balloon are the force of...

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61. The forces on the balloon are the force of gravity mg G (down) and the force of the air G F a (up). We take the + y to be up, and use a to mean the magnitude of the acceleration (which is not its usual use in this chapter). When the mass is M (before the ballast is thrown out) the acceleration is downward and Newton’s second law is F a Mg = – Ma . After the ballast is thrown out, the mass is
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This note was uploaded on 05/17/2011 for the course PHY 2049 taught by Professor Any during the Spring '08 term at University of Florida.

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