4. A droplet of water at 70F 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. surface tension Ib/ff Answer:

Elements Of Electromagnetics
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Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
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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
İb/ft
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
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 İb/ft 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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