61. The forces on the balloon are the force of gravity mgG(down) and the force of the air GFa(up). We take the +yto be up, and use ato mean the magnitudeof 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 Fa– 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.