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31. A hot air balloon has mass 2500. kg including pilot and passengers. Assuming the outside air has density 1.30 kg/m', what is the radius

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31. A hot air balloon has mass 2500. kg including pilot and passengers. Assuming the outside air has density 1.30 kg/m', what is the radius of the balloon (assuming a spherical shape)? 32. How many more kilograms could the balloon of #31 lift if the outside air density increases to 1.42 kg/m

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