Utexas
Utexas
Utexas
This print-out should have 31 questions. The air pressure above the liquid in figure is
Multiple-choice questions may continue on 0.589 atm . The depth of the air bubble in the
the next column or page – find all choices liquid is 35.7 cm and the liquid’s density is
before answering. 820 kg/m3 .
air
001 10.0 points
Air within the funnel of a large tornado may
have a pressure of only 0.52 atm.
What is the approximate outward force F 35.7 cm
on a 8.9 m × 16 m wall if a tornado suddenly
envelopes the house? Atmospheric pressure is air
1.013 × 105 Pa.
Answer in units of N.
Determine the air pressure in the bubble
002 10.0 points
suspended in the liquid. The acceleration of
If a 1-megaton nuclear weapon is exploded gravity is 9.8 m/s2 .
at ground level, the peak overpressure (that
Answer in units of Pa.
is, the pressure increase above normal atmo-
spheric pressure) will be 0.2 atm at a distance
007 (part 1 of 2) 10.0 points
of 6 km.
Engineers have developed a bathyscaph that
What force due to such an explosion will be
can reach ocean depths of 6.01 mi.
exerted on the side of a house with dimensions
If the density of seawater is about
2.14 m × 34.3 m?
1030 kg/m3 , what is the absolute pressure
Answer in units of N.
at that depth? The acceleration of gravity is
9.8 m/s2 .
003 10.0 points
Answer in units of Pa.
The four tires of an automobile are inflated to
a gauge pressure of 2.3 × 105 Pa. Each tire
008 (part 2 of 2) 10.0 points
has an area of 0.026 m2 in contact with the
If the inside of the vessel is maintained at
ground.
atmospheric pressure 1.013 × 105 Pa, what
Find the weight of the automobile.
is the net force on a porthole of diameter
Answer in units of N.
6.01 cm?
Answer in units of N.
004 (part 1 of 2) 10.0 points
A water bed is 1.94 m on each vertical side
009 (part 1 of 2) 10.0 points
and 24.3 cm high.
A reservoir behind a dam is 30 m deep.
Find its weight. The acceleration of grav-
What is the gauge pressure at the base
ity is 9.8 m/s2 and the density of water is
of the dam? The acceleration of grav-
1000 kg/m3 . 2
ity is 9.8 m/s and atmospheric pressure is
Answer in units of N.
10100 Pa .
Answer in units of kPa.
005 (part 2 of 2) 10.0 points
Find the pressure exerted on the floor when
010 (part 2 of 2) 10.0 points
the bed rests in its normal position. Assume
What is the gauge pressure 5.5 m from the
that the entire lower surface of the bed makes
top of the dam?
contact with the floor.
Answer in units of kPa.
Answer in units of Pa.
011 (part 1 of 2) 10.0 points
006 10.0 points
eng (re5556) – HW01 – horvitz – (92187) 2
A simple U-tube that is open at both ends
is partially filled with a liquid of density 013 10.0 points
424 kg/m3 . Water is then poured into one The small piston of a hydraulic lift has a
arm of the tube, forming a column 14 cm in cross-sectional area of 4.5 cm2 and the large
height, as shown in the diagram. piston has an area of 59 cm2 , as in the figure
below.
h1 F
area
light liquid 4.5 cm2
424 kg/m3
14 cm
59 cm2
h2 11 in
2
14 cm light liquid 1
424 kg/m3
F
Mg
016 10.0 points
Consider a spherical balloon submerged in
water. What is the force exerted by the wa-
At what depth does the buoyant force de- ter on the top of the block? (Take P0 =
1 1.013 × 105 Pa .) The acceleration of gravity
crease to of its surface value? Assume wa- is 9.8 m/s2 .
4.4
ter temperature does not change with depth Answer in units of N.
and use Pa = 1.01 × 105 Pa. The acceleration
of gravity is 9.8 m/s2 . 019 (part 2 of 4) 10.0 points
Answer in units of m. What is the force exerted by the water on the
bottom of the block?
017 10.0 points Answer in units of N.
Two identical glasses are filled to the same
water level. One of the two glasses has ice 020 (part 3 of 4) 10.0 points
cubes floating in it. What is the reading of the spring scale?
Which weighs more? Answer in units of N.
1. The glass with the ice cubes. 021 (part 4 of 4) 10.0 points
What is the buoyant force?
2. The glass without the ice cubes. Answer in units of N.
water
5.8 m/s v2
3.3 cm 2.4 cm
eng (re5556) – HW01 – horvitz – (92187) 5
has a 30 cm radius. Take the pressure in the
section with radius 70 cm to be 190 kPa and
the density of oil to be 800 kg/m3 . Assume
laminar nonviscous flow.
Answer in units of kPa.
13 cm
v
x h
h0 h