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Q. A uniform-density 8 kg disk of radius 0.20 m is mounted on a nearly frictionless axle. Initially it is not spinning. A string is wrapped tightly around the disk, and you pull on the string with a constant force of 45 N through a distance of 0.7 m. Now what is the angular speed?

Q. A spherically shaped balloon has a radius of 11 m, and is filled with helium. How much extra mass a cargo can lift, assuming that the skin and the cargo of the balloon have a mass of 950 kg? Neglect the buoyant force on the cargo volume itself.(the density of air is 1.29 kg/m3 and the density of helium is 0.179 kg/m3)

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