A droplet of water at 70°F having a diameter of 0.03 in. is in contact with air. If the internal pressure within the droplet of water is 0.09 psi greater than the barometric pressure, estimate the value of surface tension of the water droplet.
A droplet of water at 70°F having a diameter of 0.03 in. is in contact with air. If the internal pressure within the droplet of water is 0.09 psi greater than the barometric pressure, estimate the value of surface tension of the water droplet.
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
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![4. A droplet of water at 70°F having a diameter of 0.03 in. is in contact with air. If the internal pressure within the
droplet of water is 0.09 psi greater than the barometric pressure, estimate the value of surface tension of the
water droplet.
Answer: a. surface tension
Ib/f
5. Air is enclosed by a rigid cylinder containing a piston. A pressure gage attached to the cylinder indicates an
initial reading of 30 psi. Determine the reading on the gage when the piston has compressed the air
isothermally to one-third its original volume. Assume the local atmospheric pressure to be 14.7 psia.
Answer: a. gage pressure
psi
6. A 25 mm diameter shaft is pulled through a cylindrical bearing as shown in the
figure. The lubricant that fills the 0.3 mm gap between the shaft and the bearing is
an oil having a kinematic viscosity of 8.0 x 10 -4m/s and a specific gravity of 0.91.
Determine the force P required to full the shaft at a velacity of 3 m/s. Assume that
the velocity distribution between the gap to be linear.
Answer:
a. force P](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F717a3ffc-ae3e-41cf-92a1-9af535fb8994%2F94a0b7aa-31ad-4247-b15d-8f4977b652ba%2Fl2gbq1p_processed.jpeg&w=3840&q=75)
Transcribed Image Text:4. A droplet of water at 70°F having a diameter of 0.03 in. is in contact with air. If the internal pressure within the
droplet of water is 0.09 psi greater than the barometric pressure, estimate the value of surface tension of the
water droplet.
Answer: a. surface tension
Ib/f
5. Air is enclosed by a rigid cylinder containing a piston. A pressure gage attached to the cylinder indicates an
initial reading of 30 psi. Determine the reading on the gage when the piston has compressed the air
isothermally to one-third its original volume. Assume the local atmospheric pressure to be 14.7 psia.
Answer: a. gage pressure
psi
6. A 25 mm diameter shaft is pulled through a cylindrical bearing as shown in the
figure. The lubricant that fills the 0.3 mm gap between the shaft and the bearing is
an oil having a kinematic viscosity of 8.0 x 10 -4m/s and a specific gravity of 0.91.
Determine the force P required to full the shaft at a velacity of 3 m/s. Assume that
the velocity distribution between the gap to be linear.
Answer:
a. force P
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