Spherical particles of density 1.8 g/cm3 are shaken in a container of water (viscosity = 1.0 × 10^?3 N/s/m3). The water is 9.0 cm deep and is allowed to stand for 30 minutes. What is the radius of the largest particles still in suspension at that time?
a. 2.5E–6 m
b. 6.4E–6 m
c. 5.4E–6 m
d. 1.8E–6 m
e. 4.1E–6 m
c
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Derive the stability criterion for an inside-corner boundary control volume for two- dimensional steady conduction when a convection boundary condition exists.
GIVEN Two-dimensional steady conduction at an inside corner with a convection boundary condition FIND (a) The stability criterion
A man who weighs 600 N is sitting in a chair with his feet on the floor and arms resting on the armrests. The chair weighs 100 N. Each armrest exerts an upward force of 25.0 N on his arms, and the seat exerts an upward force of 500 N. What force does the floor exert on his feet?
A. 75 N upward B. 500 N upward C. 525 N upward D. 50 N upward E. 0 N
The luminosity of a star is determined by the star's ________ and ________.
A. diameter; surface temperature B. apparent brightness; surface temperature C. brightness; temperature D. distance; surface temperature E. diameter; distance
An object is placed 10 cm in front of a mirror, and an image is formed that has a magnification of 2 . Which of the following statements is false?
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