Ice or compacted snow sublimes to a saturated vapor in cold climates. Estimate the rate at which ice will sublime per unit area on an iceberg if the ice is -30ºC and the air is - 10ºC. Assume a convective heat transfer coefficient of 20 W/m^2?K.
What will be an ideal response?
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Protoplanets
a. grew in size primarily by accretion. b. grew in size primarily by condensation. c. are still visible today as the terrestrial planets. d. grew in size by collecting the particles in the solar wind. e. grew in size by the collision and coalescing of planetesimals.
When a constant and sustained upward force acts on a rocket, its acceleration increases mainly because
A) gravity becomes weaker with increased distance. B) the mass of the rocket decreases as fuel is burned. C) No way, for acceleration would be constant.
A heavy weight is supported by two cables that exert tensions of magnitude 
and 
. Which statement is correct?
?
?
A.
= 
.B.
= 
.C.
>.D.
<.E.
Three identical point charges (+2.0 nC) are placed at the corners of an equilateral triangle with sides of 2.0-m length. If the electric potential is taken to be zero at infinity, what is the potential at the midpoint of any one of the sides of the triangle?
a. 16 V b. 10 V c. 70 V d. 46 V e. 44 V