Physics 121 General Physics
Concept Quizzes
Chapter 14 Fluid Mechanics

Two dams are identical in size and shape and the water levels at both are the same. One dam holds back a lake containing 2 million m³ of water while the other hold back a 4 million m³ lake. Which statement is correct concerning the average force on the dams?

	The dam with the larger lake has twice the average force on it.
	The dam with the smaller lake has twice the average force on it.
	The dam with the larger lake has a slightly larger average force on it.
	None of the above.

The Wood and Iron have equal volumes. The wood floats while the iron sinks in water. Which has the greater buoyant force on it?

	The Wood.
	The Iron.
	They have equal buoyant forces on them.

The Aluminum and the Lead have equal masses. Which has the greater buoyant force on it?

	The Aluminum.
	The Lead.
	They both have the same buoyant force.
	Can't tell without knowing their volumes.

A pipe has input diameter a. The speed of water flow at the input is v₀. Output diameter is 3a. What is the speed of water flow at the pipe output.

	3 v0
	1/3 v0
	9 v0
	1/9 v0

A Blood Platelet drifts along with the flow of bood through an artery that is partially blocked by deposits. As the platelet moves from the narrow region to the wider region

1. its speed

	increases.
	remains the same.
	decreases.

2. it experiences

	an increase in pressure.
	no change in pressure.
	a decrease in pressure.