Traffic and Highway Engineering
5th Edition
ISBN: 9781305156241
Author: Garber, Nicholas J.
Publisher: Cengage Learning
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Question
Chapter 15, Problem 5P
To determine
Using the minimum length based on SSD criteria find the minimum length of a crest vertical curve and assumptions used.
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A 200-lb block is at rest on a 30° inclined plane. The
coefficient of friction between the block and the
inclined plane is 0.20. Compute the value of a
horizontal force P that will cause motion to impend
the block up the inclined plane.
200 lb
P
30°
Please explain step by step
Problem 1
=
=
= 13,600
Manometers can be used in combination with cardiovascular catheters to measure blood
pressure based on height differences. In the example in Figure 1, the manometer
contains two fluids: water (density p 995 Kg/m³) and mercury (density pm
Kg/m³). The density of blood is p 1,060 Kg/m³. Assume that there is atmospheric
pressure at the interface between mercury and air. The interface between mercury and
water is at z₁ = 7 cm, the interface between water and blood is at Z2 27 cm, and the
tip of the manometer at za 10 cm.
Recall that the fluid statics equation is dp/dz-pg 0, when the z axis is taken
pointing downwards.
a. What is the gauge pressure po at the interface with air, in mmHg? (5 points)
b. Calculate the gauge pressure ps at the tip of the manometer, in mmHg. (5
points)
N
Z37
blood
ப
Zz
Water
Mercury
Zo
3=0
z
Figure 1. Manometer for blood pressure measurement.
Chapter 15 Solutions
Traffic and Highway Engineering
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