Physics, 11e WileyPLUS + Loose-leaf
11th Edition
ISBN: 9781119394112
Author: John D. Cutnell, Kenneth W. Johnson, David Young, Shane Stadler
Publisher: Wiley (WileyPLUS Products)
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Chapter 15, Problem 9P
To determine
The average pressure of the expanding gas.
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Assume all gases in this problem are ideal.
A person is in a closed room (a racquetball court) with V = 438 m hitting a ball (m = 42.0 g) around at random without any pauses. The average kinetic energy of the ball is 2.10 J.
(a) What is the average value of v, in (m2/s²)?
m²/s²
Does it matter which direction you take to be x?
O Yes
O No
(b) Applying the methods of this chapter, find the average pressure on the walls (in Pa).
Pa
(c) Aside from the presence of only one "molecule" in this problem, what are the main assumptions in the kinetic theory of gases that do not apply here? (Select all that apply.)
O the motion of the ball is isotropic
O van der Waals forces are not negligible
O gravity is negligible
O the motion of the ball is in the x-direction only
O the collision between the ball and the wall are inelastic
Assume all gases in this problem are ideal.
A person is in a closed room (a racquetball court) with V-448 m² hitting a ball (m 42.0 g) around at random without any pauses. The average kinetic energy of the ball is 2.00 3.
(a) What is the average value of v,2 in (m²/s)?
31 75
Does it matter which direction you take to be x?
O Yes
No
(b) Applying the methods of this chapter, find the average pressure on the walls (in Pa).
354
X Pa
(c) Aside from the presence of only one "molecule" in this problem, what are the man assumptions in the kinetic theory of gases that do not apply here? (Select all that apply)
the motion of the ball is in the x direction only
gravity is negligible
Van der Waals forces are not negligible
the collision between the ball and the wall are inelastic
the motion of the ball is isotropic
X
Arteriosclerotic plaques forming on the inner wall of arteries can decrease the
effective cross-sectional area of an artery. Even small changes in the effective
area of an artery can lead to very large changes in the blood pressure in the artery
and possibly to the collapse of the blood vessel.
Imagine a healthy artery, with blood flow velocity of vo equals 0.14 m/s and mass
per volume of p = 1050 kg/m³. The kinetic energy per unit volume of blood is given
pv². This is one of the terms in Bernoulli's equation. Imagine that plague
has narrowed an artery to 1/10 of its normal cross-sectional area, a 90% blockage.
1
2
by ko
=
a) Compared to normal blood flow velocity, vo, what is the velocity of blood
as it passes through this blockage?
b) By what factor does the kinetic energy per unit of blood volume change
as the blood passes through this blockage?
c) Using Bernoulli's equation as the blood passes through this blockage,
what happens to the blood pressure?
Chapter 15 Solutions
Physics, 11e WileyPLUS + Loose-leaf
Ch. 15 - Prob. 1PCh. 15 - Prob. 3PCh. 15 - Prob. 4PCh. 15 - Prob. 5PCh. 15 - Prob. 6PCh. 15 - Prob. 7PCh. 15 - Prob. 8PCh. 15 - Prob. 9PCh. 15 - Prob. 10PCh. 15 - Prob. 11P
Ch. 15 - Prob. 14PCh. 15 - Prob. 15PCh. 15 - Prob. 16PCh. 15 - Prob. 17PCh. 15 - Prob. 18PCh. 15 - Prob. 19PCh. 15 - Six grams of helium (molecular mass = 4.0 u)...Ch. 15 - Prob. 22PCh. 15 - Prob. 23PCh. 15 - Prob. 24PCh. 15 - Prob. 25PCh. 15 - Prob. 26PCh. 15 - Prob. 27PCh. 15 - Prob. 30PCh. 15 - Prob. 34PCh. 15 - Prob. 35PCh. 15 - Prob. 36PCh. 15 - Prob. 37PCh. 15 - Prob. 38PCh. 15 - Prob. 41PCh. 15 - Prob. 42PCh. 15 - Prob. 44PCh. 15 - Prob. 46PCh. 15 - Prob. 47PCh. 15 - Prob. 48PCh. 15 - Due to design changes, the efficiency of an engine...Ch. 15 - Prob. 50PCh. 15 - Prob. 53PCh. 15 - Prob. 55PCh. 15 - The hot reservoir for a Carnot engine has a...
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