Fluids unit test
A test on this unit alone, marked as a percentage and a letter grade — for the test your class is actually sitting, rather than for May. Answer everything, then submit once: seeing the answer to question 3 before attempting question 4 makes the final percentage meaningless.
Limits of Bernoulli's equation
Gauge vs absolute pressure
Torricelli's result
Archimedes' principle
Pressure with depth
Assumptions in Bernoulli's equation
Why pressure is the same at equal depths
Where Bernoulli's equation fails
Pressure
Why a steel ship floats
Condition for floating
Fraction submerged
Short answer 1. Define or explain: Buoyancy is a pressure difference
3 ptsShort answer 2. Define or explain: Applying Bernoulli and continuity together
3 ptsShort answer 3. Define or explain: Floating condition
3 ptsShort answer 4. Define or explain: Bernoulli's terms are energies per unit volume
3 ptsFree response
7 ptsA solid cube of side 0.10 m and mass 0.72 kg is placed in a container of water (density 1000 kg/m³). (a) Determine whether the cube floats or sinks, showing your reasoning. (b) If it floats, calculate the depth to which it is submerged; if it sinks, calculate its apparent weight when fully submerged. (c) The water is replaced with a fluid of density 700 kg/m³. Describe qualitatively what happens to the cube and justify your answer using the same principle.
Determine whether the cube floats or sinks, showing your reasoning.
If it floats, calculate the depth to which it is submerged; if it sinks, calculate its apparent weight when fully submerged.
The water is replaced with a fluid of density 700 kg/m³. Describe qualitatively what happens to the cube and justify your answer using the same principle.