3 An empty hot tub has a mass of 320 kg. When filled, the tub holds 600 gallons of water (rho = 62.4 lbm/ft3). The local acceleration due to gravity is 32 ft/s2. Determine the total weight of the hot tub and water in pounds-force (lbf)

Total weight of the hot tub and water is 5676.6 pounds-force

Explanation:

rho = 62.4lbm/ft^3 * 1ft^3/7.481gal = 8.34lbm/gal

Mass of water = rho * volume = 8.34lbm/gal * 600 gallons = 5004lbm = 5004*0.45359kg = 2269.8kg

Total mass of hot tub and water = 320kg + 2269.8kg = 2589.8kg

Local acceleration due to gravity = 32ft/s^2 = 32ft/s^2 * 1m/3.2808ft = 9.75m/s^2

Total weight of hot tub and water = 2589.8kg * 9.75m/s^2 = 25250.55N = 25250.55/4.4482 lbf = 5676.6 lbf