What is the Schmidt number normally assumed to be for convective mass transfer?
What will be an ideal response?
The Schmidt number is assumed to be around the value of unity, or one.
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A child grips tightly the outer edge of a playground merry-go-round as other kids push on it to give it a dizzying rotational velocity. When the other kids let go, the horizontal component of the net force on the child points most nearly
A. Inward toward the center of the merry-go-round. B. Outward away from the center of the merry-go-round. C. In the direction of rotation. D. Nowhere: the net force’s horizontal component is zero. E. In some other direction (specify).
At the microscopic level, electric currents in wires are due to
A) electromagnetic radiation. B) the great pumpkin. C) protons [and possibly other ions] traveling along the wire. D) atoms jiggling back and forth within the wire. E) electrons traveling along the wire.
O-type stars
A) have lifetimes long enough for advanced life to evolve B) have lifetimes long enough for planets to form and for life to appear, but not long enough for advanced life C) do not contain enough heavy elements to form planets D) have lifetimes too short for planet formation
The horizontal surface on which the block slides is frictionless. The speed of the block before it touches the spring is 6.0 m/s. How fast is the block moving at the instant the spring has been compressed 15 cm? k = 2.0 kN/m
a.
3.7 m/s
b.
4.4 m/s
c.
4.9 m/s
d.
5.4 m/s
e.
14 m/s