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Q. The third floor of a house is 6.00 m above street level. How much work is essential to move a 159 kg refrigerator to the third floor?

Q. What is the maximum weight that a "massless" balloon filled with 1.00 meters cubed of helium can lift into the air? Assume that the density of air is 1.20 kg/m cubed and that of helium is 0.177kg/m cubed.

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