Air fills a 2-m-diameter balloon at 20ºC and 5 kPa gage. Additional air is forced into the balloon until it reaches 8 m in diameter at a gage pressure of 8 kPa, while the temperature remains constant. The added mass is nearest:
A) 339 kg
B) 301 kg
C) 287 kg
D) 269 kg
A) 339 kg
The units need not be inserted along with the numbers if you are familiar with the units involved. It forces you to work two problems, one with the numbers and another with the units. You should, however, be careful with units when you first work a new type of problem. Always use m, kg, and s, and kPa (absolute) and K (kelvins). Then you will seldom go wrong. But, check the units if you are not sure of them.
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