 |
|
|
|
|
|
|
Find the pressure increase in the fluid in a syringe when a nurse applies a force of 42 N to the syringe's circular piston, which has a radius of 1.1 cm. ...MORE
Subject: Physics | Topic: Fluids | ID: 155035
|
$ 0 |
|
|
|
|
Three liquids that will not mix are poured into a cylindrical container. The volumes and densities of the liquids are 0.50 L, 2.6 g/cm^3; 0.25 L, 1.0 g/cm^3; and 0.40 L, 0.80 g/cm^3.
What is the force on the bottom of the container due to these liquids?
One liter = 1 L = 1000 cm^3. (Ignore the contribution due to the atmosphere.)
...MORE
Subject: Physics | Topic: Fluids | ID: 155036
|
$ 1.0 |
|
|
|
|
An office window has dimensions 3.4 m by 2.1 m. As a result of the passage of a storm, the outside air pressure drops to 0.96 atm, but inside the pressure is held at 1.0 atm.
What net force pushes out on the window? ...MORE
Subject: Physics | Topic: Fluids | ID: 155037
|
$ 1.0 |
|
|
|
|
You inflate the front tires on your car to 28 psi. Later, you measure your blood pressure, obtaining a reading of 120/80, the readings being in mm Hg. In metric countries (which is to say, most of the world), these pressures are customarily reported in kilopascals (kPa).
In kilopascals, what are (a) your tire pressure and
(b) your blood pressure? ...MORE
Subject: Physics | Topic: Fluids | ID: 155038
|
$ 1.0 |
|
|
|
|
A fish maintains its depth in fresh water by adjusting the air content of porous bone or air sacs to make its average density the same as that of the water. Suppose that with its air sacs collapsed, a fish has a density of 1.08 g/cm3^ .
To what fraction of its expanded body volume must the fish inflate the air sacs to reduce its density to that of water? ...MORE
Subject: Physics | Topic: Fluids | ID: 155039
|
$ 1.0 |
|
|
|
|
An airtight container having a lid with negligible mass and an area of 77 cm^2 is partially evacuated. If a 480 N force is required to pull the lid off the container and the atmospheric pressure is 1.0 x 10^5 Pa,
what is the air pressure in the container before it is opened? ...MORE
Subject: Physics | Topic: Fluids | ID: 155040
|
$ 0 |
|
|
|
|
In 1654 Otto von Guericke, inventor of the air pump, gave a demonstration before the noblemen of the Holy Roman Empire in which two teams of eight horses could not pull apart two evacuated brass hemispheres.
(a) Assuming that the hemispheres have thin walls, so that R in Fig. may be considered both the inside and outside radius, show that the force F required to pull apart the hemispheres has magnitude F = Pi*R^2*Delta_p, where Delta_p is the difference between the pressures outside and inside the sphere.
(b) Taking R as 30 cm, the inside pressure as 0.10 atm, and the outside pressure as 1.00 atm, find the force magnitude the teams of horses would have had to exert to pull apart the hemispheres.
(c) Explain why one team of horses could have proved the point just as well if the hemispheres were attached to a sturdy wall. ...MORE
Subject: Physics | Topic: Fluids | ID: 155042
|
$ 1.0 |
|
|
|
|
Calculate the hydrostatic difference in blood pressure between the brain and the foot in a person of height 1.83 m.
The density of blood is 1.06 x 10^3 kg/m^3. ...MORE
Subject: Physics | Topic: Fluids | ID: 155043
|
$ 0 |
|
|
|
|
(a) Assuming the density of seawater is 1.03 g/cm^3, find the total weight of water on top of a nuclear submarine at a depth of 200 m if its (horizontal cross-sectional) hull area is 3000 m^2.
(b) In atmospheres, what water pressure would a diver experience at this depth?
(c) Do you think that occupants of a damaged submarine at this depth could escape without special equipment? ...MORE
Subject: Physics | Topic: Fluids | ID: 155044
|
$ 1.0 |
|
|
|
|
Crew members attempt to escape from a damaged submarine 100 m below the surface.
What force must be applied to a pop-out hatch, which is 1.2 m by 0.60 m, to push it out at that depth?
Assume that the density of the ocean water is 1025 kg/m^3. ...MORE
Subject: Physics | Topic: Fluids | ID: 155045
|
$ 1.0 |
|
|
|
|
A cylindrical barrel has a narrow tube fixed to the top, as shown (with dimensions) in Fig.15-14 The vessel is filled with water to the top of the tube.
Calculate the ratio of the hydrostatic force on the bottom of the barrel to the gravitational force on the water contained inside the barrel.
Why is that ratio not equal to one?
(You need not consider the atmospheric pressure.)
...MORE
Subject: Physics | Topic: Fluids | ID: 155047
|
$ 1.0 |
|
|
|
|
Two identical cylindrical vessels with their bases at the same level each contain a liquid of density Ro. The area of each base is A, but in one vessel the liquid height is h1, and in the other it is h2.
Find the work done by the gravitational force in equalizing the levels when the two vessels are connected. ...MORE
Subject: Physics | Topic: Fluids | ID: 155048
|
$ 1.0 |
|
|
|
|
In analyzing certain geological features, it is often appropriate to assume that the pressure at some horizontal level of compensation, deep inside Earth, is the same over a large region and is equal to the pressure due to the gravitational force on the overlying material. Thus, the pressure on the level of compensation is given by the fluid pressure formula. This model requires, for one thing, that ountains have roots of continental rock extending into the denser mantle (Fig.15-16 ). Consider a mountain 6.0 km high. The continental rocks have a density of 2.9 g/cm^3, and beneath the continent the mantle has a density of 3.3 g/cm^3.
Calculate the depth D of the root.
{Hint: Set the pressure at points a and b equal; the depth у of the level of compensation will cancel out.) ...MORE
Subject: Physics | Topic: Fluids | ID: 155050
|
$ 1.0 |
|
|
|
|
The L-shaped tank shown in Fig.15-18 is filled with water and is open at the top. If d = 5.0 m, what are
(a) the force on face A and
(b) the force on face В due to the water? ...MORE
Subject: Physics | Topic: Fluids | ID: 155052
|
$ 1.0 |
|
|
|
|
Water stands at a depth D behind the vertical upstream face of a dam, as shown in Fig.15-19 Let W be the width of the dam.
Find (a) the net horizontal force on the dam from the gauge pressure of the water and
(b) the net torque due to that force (and thus gauge pressure) about a line through О parallel to the width of the dam.
(c) Find the moment arm of the net horizontal force about the line through O. ...MORE
Subject: Physics | Topic: Fluids | ID: 155054
|
$ 2.0 |
|
|
|
|
To suck lemonade of density 1000 kg/m^3 up a straw to a maximum height of 4.0 cm, what minimum gauge pressure (in atmospheres) must you produce in your lungs?
...MORE
Subject: Physics | Topic: Fluids | ID: 155055
|
$ 0 |
|
|
|
|
What would be the height of the atmosphere if the air density
(a) were uniform and
(b) decreased linearly to zero with height?
Assume that at sea level the air pressure is 1.0 atm and the air density is 1.3 kg/m^3. ...MORE
Subject: Physics | Topic: Fluids | ID: 155056
|
$ 1.0 |
|
|
|
|
A piston of small cross-sectional area a is used in a hydraulic press to exert a small force f on the enclosed liquid. A connecting pipe leads to a larger piston of cross-sectional area A (Fig.15-22 ).
(a) What force magnitude F will the larger piston sustain without moving?
(b) If the small piston has a diameter of 3.80 cm and the large piston one of 53.0 cm, what force magnitude on the small piston will balance a 20.0 kN force on the large piston?
...MORE
Subject: Physics | Topic: Fluids | ID: 155058
|
$ 1.0 |
|
|
|
|
In the hydraulic press fig 15-23, through what distance must the large piston be moved to raise the small piston a distance of 0.85 m? ...MORE
Subject: Physics | Topic: Fluids | ID: 155060
|
$ 1.0 |
|
|
|
|
A boat floating in fresh water displaces water weighing 35.6 kN.
(a) What is the weight of the water that this boat would displace if it were floating in salt water with a density of 1.10 x 10^3 kg/m^3?
(b) Would the volume of the displaced water change? If so, by how much?
...MORE
Subject: Physics | Topic: Fluids | ID: 155061
|
$ 1.0 |
|
|
