PHY210 TUTORIAL 4 (1).docx - Solution: PHY 210/AZIANTY...

PHY 210/AZIANTY SARONI/MARCH-JULY 2020
TUTORIAL 4
FLUID
1. A student floats in a salt lake with one-third of his body above the surface. If the density
of his body is 970 kg/m 3 , what is the density of the lake water? )
2. Determine;
a. the absolute pressure at an ocean depth of 1500 m. Assume the density of
seawater is 1030 kg/m 3 and the air above exerts a pressure of 101.3 kPa.
b. at the ocean depth 1500 m, the buoyant force on a spherical undersea vehicle
having a diameter of 5.0 m.
c. Whether the buoyant force in part ii) is enough to push the undersea vehicle of
mass 400 kg out of the ocean if its engine failed. State your reasoning.
3. A weather balloon of mass 600 kg is designed to lift a load of mass 4000 kg. Calculate the
volume of helium is needed to to lift the load. (Given g = 9.81 ms -2 , density of the air =
1.29 kg m -3 and density of helium = 0.18 kg m -3 ) )
4. A solid cube is 7.5 cm on each side. It floats in oil of density 800 kg/m 3 with one third of