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Unformatted text preview: Ch. 18
Question Q, chap 18, sect 4. part 1 of 1 1] points The small piston of a hydraulic lift has a cross—sectional area of 8 cm2 and the large
piston has an area of 32 cm2, as in the ﬁgure
below. What force F must be applied to the small
piston to raise a load of 34 kW? Question lﬂ, chap 18, sect 2.
part 1 of 1 1] points A constriction in a pipe reduces its diameter
ﬂ'om 7.1 cm to 3.3 cm. Where the pipe is wider, the ﬂuid velocityr is 8.0 mf's.
Find the ﬂuid velocity where the pipe is
narrow. Question 12, chap 18, sect 5.
part 1 of 2 1] points A rectangular barge 6 m long and 2 m
wide ﬂoats in fresh water. Water densityr is was kglfrna.
How much deeper will it ﬂoat when loaded with a ﬂﬂﬂ kg horse?
Question 13, chap 18, sect 5. part 2 of 2 1] points If the barge can only be pushed 9.3?5 cm deeper into the water before water overﬂows
to sink it, how many 300 kg horses can it carry? Question 11, chap 18, sect 4.
part 1 of 1 1] points Piston 1 in the ﬁgure has a diameter of
[1.28 in and is attached to a lever arm a dis tance 2.1 in from the pivot point. Piston 2
has a diameter of 1.5 in. An external force F
acts on the lever arm at a distance 18 in from
piston 1 as shown below. Assume the height difference between pis—
ton 1 and piston 2 isnegligible. In the absence of friction, ﬁnd the force F necessary to sup—
port the ﬁTﬁ lb weight. Question 14, chap 18, sect 4.
part 1 of 2 1'] points Consider a vertical dam of width is and
height h. ﬂ'om the bottom to the waterline. it What is the total horizontal force on the
dam?
Question 15, chap 18, sect 4.
part 2 of 2 1] points Consider a new dam where the height is
doubled and the width is only one third of the
original value. The ratio of the total force exerted on the new dam to that on the original dam :15 is
given by Question 16, chap 18, sect 8.
part 1 of 1 1] points Note: Pam, = 181380 Pafatm. The viscos—
ity of the ﬂuid is negligible and the ﬂuid is incompressible. .
A liquid of densityr 1169 kg;f n13 ﬂows with
speed 2.?3 mfs into a pipe of diameter 8.12 m. The diameter of the pipe decreases to 8.85 m
at its exit end. The exit end of the pipe is 5.28 m lower than the entrance of the pipe,
and the pressure at the exit of the pipe is 1.] atm.
The acceleration of gravity is 9.8 m,v"s2 . Applying Bernoulli’s principle, what is the
pressure P1 at the entrance end of the pipe?
Question 1?, chap 18, sect 5. part 1 of 1 1] points A light spring with a spring constant of
It = 18.5 me rests vertically on the bottom
of a large beaker of water, as shown in (a; The acceleration of gravity is 9.81 m,v"s .
A 8.88442 kg block of wood with a density of 633.3 kgfm3 is connected to the spring, and the mass—spring system is allowed to come
to static equilibrium, as shown in [b]. The
magnitude of the force pulling the spring back
to its unstretched position equals F = it: ﬁt. {a} How far ﬂat does the spring stretch? Question 18, chap 18, sect 8.
part 1 of 1 18 points A vessel is ﬁlled with a liquid of density
1735 kgf'mB. There are two holes (one above
the other] in the side of the vessel. Liquid
is streaming out of both of these holes in a
horizontal direction. The acceleration of gravity is 9.8 m,v"s2 . The upper hole is a distance 7'? 111 down ﬁ‘om the surface of the liquid. The lower hole
is a distance 173 m down from the surface of the liquid. 173 n1 0
O In. '
0:.
o
o
.0 O O
a... .0 .10 O
a 0’0’
9 o o
‘9‘ O O f .
.0
ﬂ
4 v
1»
‘51 ﬂ .0 .1
t O .1. The ﬁgure is not drawn to scale. At what horizontal distance “I” does the stream from the upper hole collide with the
stream from the lower hole? Question 19, chap 18, sect 3.
part 1 of 1 1] points A water tank with a valve at the bottom is
shown. Assume: The cross—sectional area at A is
very large compared with that at E. The ac
celeration of gravityr is 9.81 rnf's2 . If this valve is opened, what is the maxi—
mum height ﬂymﬂm [above the opening of the
spigot] attained by the water stream coming
out of the discharge spigot [at ET? Question 2U, chap 13, sect 5. part 1 of 1 1] points A sample of an unknown material weighs ZQ‘QJJ N in air and 194.8 N when submerged in an alcohol solution with a density of 0.676 X
103 kgme.
What is the densityr of the material?
Question 21, chap 13, sect 4. part 1 of 1 1] points The air pressure above the liquid in ﬁgure is
[1.823 atm. The depth of the air bubble in the
liquid is h = £12.? cm and the liquid ’s densityr
is 821 kgf'ma. The acceleration of gravity is 9.3 Infs2 . air T density
£12.? cm of liquid i 321 kgfma Determine the air pressure in the bubble
suspended in the liquid. ...
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