3-35 The hydraulic lift in a car repair shop has an output diameter of 30 cm and is to lift cars up to 2000 kg. Deter. mine the fluid gage pressure that mast he maintained in the reservoir. M Fres
3-35 The hydraulic lift in a car repair shop has an output diameter of 30 cm and is to lift cars up to 2000 kg. Deter. mine the fluid gage pressure that mast he maintained in the reservoir. M Fres
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Transcribed Image Text:height of each fluid in that arm.
FIGURE P3-38E
-39E Repent Proh. 3-38E by replacing air by oil with a
specific gravity of 0.69.
Noil
340 The gage pressure of the air in the tank shown in Fig.
P3-40 is measured to be 65 kPa Determine the differential
height k of the mercury column.
70 cm
-Water
-Oil
FIGURE P3-34
65 RPa
SG-072
75 em
3-35 The hydraulic lift in a car repair shop has an output
diameter of 30 cm and is to lift cars up to 2000 kg. Deter-
mine the fluid gage pressure that must be maintained in the
reservoir.
Air
Water
30 cm
Mercury
SG- 13.6
3-36 Freshwater and seawater flowing in parallel horizontal
pipelines are connected to each ather by a double U-tube
Air
FIGURE P3-40
Resh
40 cm
341 Repeat Prob. 3-40 for a gage pressure of 45 kPa.
42 The top part of a water tank is divided into two com-
partments, as shown in Fig. P3-42 Now a fluid with an
unknuwn density is poured into ane side, and the water level
tises a certain amount on the other side to compensate for
this effect. Based on the final fluid heights shown on the fig-
ure, determine the density of the fluid added. Assume the liq-
70 cm
Sra
water
10 cm
-Mercury
FIGURE P3-36
uid does not mix with water.
107
CHAPTER 3
the two arms is 32 in, determine the pressure difference
between the two tanks. The densities of eil and mercury are
45 lbm/ft' and 848 Ibm/ft', respectively.
Urknen
liquid
3-45 Pressure is often given in terms of a liquid column
and is expressed as "pressure head." Express the standard
atmospheric pressure in terms of (a) mercury (SG - 13.6),
(b) water (SG = 1.0), and (c) glycerin (SG = 1.26) columns.
Explain why we usually use mercury in manometers,
80 cm
95 cm
WATER
3-46 A simple experiment has long heen used to demon-
strate how negative pressure prevents water from being
spilled out of an inverted glass. A glass that is fully filled by
water and covered with a thin paper is inverted, as shown in
Fig. P3-46. Determine the pressure at the bottom of the
glass, and explain why water does not fall out.
50 cm
FIGURE P3-42
343 The 500- kg load on the hydraulic lift shown in Fig.
P3-43 is to be raised by pouring oil (p = 780 kg/m') into a
thin tube. Determine how high h should be in order to begin
to raise the weight.
Glass
10 c
Water
LOAD
500 kg
A piece
uf paper
-1.2m
I em-
FIGURE P3-46
3-47 Two chambers with the same fluid at their hase are
separated by a piston whose weight is 25 N, as shown in Fig.
P3-47. Calculate the gage pressures in chambers A and 8.
FIGURE P3-43
Pistan
344E Two eil tanks are connocted to cach other through a
manometer. If the difference between the mercury levels in
Air
Air D
Oil
Oil
50 em
10 in
10m
25 cm
1l cm
32 in
Water
00 c
-Mercury
FIGURE P3-44E
FIGURE P3-47
108
FLUID MECHANICS
3-50 Consider the system shown in Fig. P3-50. If a change
of 0.7 kPa in the pressure of air causes the brine-mercury
interface in the right column te drop by 5 mm in the brine
level in the right column while the pressure in the brine pipe
remains constant, determine the ratio of A-JA,-
3-48 Consider a dauble-fluid manometer attached to an air
pipe shown in Fig. P3-48, If the specific gravity of ene fluid
is 13.55, determine the specific gravity of the other tluid for
the indicated absolute pressure of air. Tuke the atmespheric
pressure to be 100 kPa. Answer. 5.0
Air
Air
(P=76 kPa
Rrine
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