Buoyancy 4Q. A balloon uses hot air to provide its lifting capability. Prior to its release it is tethered to the ground by a steel cable. If the gondola, weights, passengers, and material weigh 2000 lb, determine the tension in the cable when the balloon is inflated as a sphere having a diameter of 60 ft. Assume that the hot air has a specific weight of 0.040 lb/ft³ and the ambient air has a specific weight of 0.070 lb/ft^3 Buoyant force Weight of "hot" air 2000 lb Cable tension

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Friction

Friction is defined as the force that prevents any solid surface, any layer of fluid, or any kind of element or material from sliding.