1) A homemade wooden raft is 1.45 m wide and 3.05 m long with vertical sides. The bottom of the raft is 0.632 m below the water surface. What is the weight (in newtons) of the raft and its cargo, if it is floating in fresh water? 2) A hot air balloon (excluding the hot air inside) together with its cargo has a mass of 420 kg. The balloon holds 715 m3 of hot air. It is floating at a constant height in air with a density of 1.28 kg/m3. What is the density (in kg/m3) of the hot air in the balloon? 3) A rock is suspended from a force probe which reads 10.7 N. A beaker of water is raised up so that the rock is totally submerged in water. The force probe now reads 7.00 N. How many times greater is the density of the rock than the density of water? 4) A toy crown when weighed in air, has a weight of 8.00 N. When completely immersed in fresh water, however, it has a weight of 4.15 N. Find the volume of the toy crown in cm3. 5) Ernie's rubber ducky is floating in the bathtub