AP Physics 2 Free response Questions: Fluids

Fluids

A scuba diver jumps into the water to inspect the capsized Costa Concordia cruise ship that ran aground off the west coast of Italy at Giglio island January 16, 2012.  REUTERS/Max Rossi

A scuba diver jumps into the water to inspect the capsized Costa Concordia cruise ship that ran aground off the west coast of Italy at Giglio island January 16, 2012. Max Rossi

A diver descends from a salvage ship to the ocean floor at a depth of 35 m below the surface. The density of ocean water is 1.025 x 103 kg/m3.

(a) Calculate the gauge pressure on the diver on the ocean floor.

(b) Calculate the absolute pressure on the diver on the ocean floor.

The diver finds a rectangular aluminum plate having dimensions 1.0 m x 2.0 m x0.03 m. A hoisting cable is lowered from the ship and the diver connects it to the plate. The density of aluminum is 2.7 x103 kg/m3. Ignore the effects of viscosity.

(c) Calculate the tension in the cable if it lifts the plate upward at a slow, constant velocity.

(d) Will the tension in the hoisting cable increase, decrease, or remain the same if the plate accelerates upward at 0.05 m/s2?

____ increase ____ decrease ____ remain the same

Explain your reasoning.