Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)
8th Edition
ISBN: 9781305387102
Author: Kreith, Frank; Manglik, Raj M.
Publisher: Cengage Learning
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Chapter 6, Problem 6.4P
An electrical transmission line of 1.2-cm diameter carries a current of 200 amps and has a resistance of
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What are the control hardware shown in the Figure?
Question 1.
A tube rotates in the horizontal ry plane with a constant angular velocity w about the z-axis. A
particle of mass m is released from a radial distance R when the tube is in the position shown.
This problem is based on problem 3.2 in the text.
R
m
2R
Figure 1
x
a) Draw a free body diagram of the particle if the tube is frictionless.
b) Draw a free body diagram of the particle if the coefficient of friction between the sides of the
tube and the particle is = k = p.
c) For the case where the tube is frictionless, what is the radial speed at which the particle
leaves the tube?
d) For the case where there is friction, derive a differential equation that would allow you to
solve for the radius of the particle as a function of time. I'm only looking for the differential
equation. DO NOT solve it.
1
e) If there is no friction, what is the angle of the tube when the particle exits?
• Hint: You may need to solve a differential equation for the last part. The "potentially
useful…
Question 2.
A smooth uniform sphere of mass m and radius r is squeezed between two massless levers, each of
length 1, which are inclined at an angle with the vertical. A mechanism at pivot point O ensures
that the angles & remain the same at all times so that the sphere moves straight upward. This
problem is based on Problem 3-1 in the text.
P
P
r
Figure 2
a) Draw appropriate freebody diagrams of the system assuming that there is no friction.
b) Draw appropriate freebody diagrams of the system assuming that there is a coefficient of
friction between the sphere and the right lever of μ.
c) If a force P is applied between the ends of the levers (shown in the diagram), and there is no
friction, what is the acceleration of the sphere when = 30°
Chapter 6 Solutions
Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)
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