What is the criterion for using lumped mass capacity?
What will be an ideal response?
The value of the mass transfer Biot number needs to be less than about 0.1 for lumped
mass capacity to be appropriate. The mass transfer Biot number is the ratio of the
convective mass transfer coefficient times a characteristic length to the self-diffusivity of
the substance diffusing.
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Star X has spectral type B. Star Y has spectral type M. What can we conclude?
A) Star X has a higher surface temperature than star Y. B) Star Y has a higher surface temperature than star X. C) Star X is more massive than star Y. D) Star Y is more massive than star X.
A net force exerted on an object opposite to the object's direction of motion decreases it speed and its kinetic energy
Indicate whether the statement is true or false
A spherical shell of inner diameter R and outer diameter 3R has a uniform density ?. What is the magnitude of the gravitational acceleration a distance 4R from the center of the spherical shell?
A) 7?G?R/6 B) 104?G?R/3 C) 27?G?R/12 D) 27?G?R/3 E) 13?G?R/6
If the temperature of the air rises, the frequency you hear is higher than f
Indicate whether the statement is true or false