# Search results

1. ### Buoyant Force

Homework Statement A 9 cm square wooden post (density=420kg/m3) is 1.3m long and floats in sweater (density=1029 kg/m3. How deep is the post submerged in the water? The picture shows a 9cm x 9cm cross section of the post. Homework Equations Fb=density of liquid x volume of liquid submerged x...
2. ### Absolute Pressure

Homework Statement A 410kg bluefin tuna rests motionless at a depth of 15m below the ocean's surface. The absolute pressure at this depth is 251,700 Pa. What is the volume of the fish? Homework Equations absolute P=gauge Pressure+atmospheric pressure 1atm=1.03e5Pa P=density x g x height...
3. ### Conservation of energy

Homework Statement A block of mass 10kg starts at the top of a frictionless track which forms a quarter circle with radius 10m. It is given an initial downward velocity of 10m/s. What is the velocity at the bottom of the track? Homework Equations KEtranslational, f+ KErotational...
4. ### Torque on a wrench

Homework Statement (a) Suppose you have just barely loosened a rusty bolt. Your mass is 80 kg and you have a wrench of length L = 50 cm placed as shown in the diagram below, and hung off the end so all your weight was applied, in the downward direction, to the end of the wrench. What is the...
5. ### Buoyant Force on a man

Homework Statement A certain man has a mass of 85.0 kg and a density of 995 kg/m3 (exclusive of the air in his lungs). (a) Calculate his volume. .0854 m3 (b) Find the buoyant force air exerts on him. N (c) What is the ratio of the buoyant force to his weight? (buoyant force / weight)...
6. ### Fluid Statics/depth in a cylinder

Homework Statement Mercury is added to a cylindrical container to a depth d and then the rest of the cylinder is filled with water. If the cylinder is 0.8 m tall and the pressure at the bottom is 1.3 atmospheres, determine the depth of the mercury. (Assume the density of mercury to be 1.36 104...
7. ### Fluid Statics

Homework Statement (a) A rectangular gasoline tank can hold 39.0 kg of gasoline when full. What is the depth of the tank if it is 0.450 m wide by 0.900 m long? m (b) What is the volume of the tank? (It is suitable for a passenger car.) gal Homework Equations Density of gas=719.7=mass/volume...
8. ### Angular Momentum; rod & disk inelastic collision

Homework Statement The figure shows an overhead view of a 2.50-kg plastic rod of length 1.20 m on a table. One end of the rod is attached to the table, and the rod is free to pivot about this point without friction. A disk of mass 39.0 g slides toward the opposite end of the rod with an initial...