When a block of mass m of unknown density is hung in air, its weight is found to be w = 4.90 N. When it is completely submerged in water, its apparent weight is measured to be wapp = 4.35 N. Find the density of the block p in kg/m The density of water Pw is 1000 kg/m³. g = 9.80 m/s².

A scale reads 100 N when a piece of aluminum is hanging from it. What does it read when it is lowered so that the aluminum is submerged in water? The mass density of aluminum is 2700 kg/m^3. Be careful, you are given mass density instead of weight density, and we are using SI units.i need answer in problem sigfig

A hollow plastic cube of side length 80 cm is held below the surface of a lake by a cord anchored to the bottom of the lake. The cube has a mass of 85 kg and the density of the lake water is 1025 kg/m. a) What is the buoyant force exerted on the cube by the lake water? b) If the top surface of the cube is 25.4 m below the surface of the lake, what is the gauge pressure at the top surface of the cube? P. = 1.013 x 10 Pa. atm c) What is the force on the top face of the cube? Note the top face will have a square cross section and the length of the side is 80 cm.