4.1 The Concepts of Force and Mass

Chapter 11
Fluids
• Mass Density
• Pressure and variation of pressure with depth in a static fluid
• Pascal’s principle
• Archimedes’ principle
• Fluids in motion
• equation of continuity
• Bernoulli’s equation
Don’t do section 11.11: viscous flow
Problem 11.19
The main water line enters a house on the first floor. The line
has a gauge pressure of 1.9105 Pa.
(a) A faucet on the second floor, 6.50 m above the first floor,
is turned off. What is the gauge pressure at this faucet?
(b) How high could a faucet be before no water would flow
from it, even if the faucet were open?
Problem 11.23
Some researchers believe that the dinosaur Barosaurus held its head
erect on a long neck, much as a giraffe does. If so, fossil remains indicate that
its heart would have been about 12 m below its brain. Assume that the blood
has the density of water, and calculate the amount by which the blood
pressure in the heart would have exceeded that in the brain. Size estimates
for the single heart needed to withstand such a pressure range up to two
tons. Alternatively, Barosaurus may have had a number of smaller hearts.