A weather balloon is filled with 1.22 cubic meters of Helium. What is the weight

Question

A weather balloon is filled with 1.22 cubic meters of Helium. What is the weight of the Helium. Ignoring the wieght of theballoon fabric, calculate the upward accelereation the balloonwould have when it is released. How long will it take toascend 100 feet?

Explanation / Answer

We know that density = mass / Volume ==> mass of helium = density x volume                                = 0.1786 x 1.22                                = 0.217892 kg Weight of the helium W = mg = 0.217892 * 9.8 = 2.135 N upward acceleration a = W / m                                   = 9.8 m/s2 the time taken to reach the 100 feet = 100*0.3048m = 30.48 m is        t = 2h/g = 2 *30.48 / 9.8 = 2.494 s

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