What mechanism likely accounts for whether a large icy planetesimal becomes a "water world" or a gas giant?
A) the timing of when the stellar wind blows away the remaining gas of the planet forming nebula
B) the amount of heavy metals initially present in the disk
C) the migration of larger planets through the disk
D) the presence of other planets to make its orbit highly eccentric
A
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If the collision is completely inelastic, how many quantities suffice to determine the system’s final state?
A. Zero B. One C. Two D. Three E. Four
The walls of a typical industrial furnace used for the heat treating of the metal are usually a composite structure made up of layers of fire brick, high temperature insulation, steel plates, and outer surface cladding. Radiant tubes/beams and/or combustion burners inside the furnace provide the requisite heat. Consider plain surface of such furnace wall where the inner wall surface is heated to 850°C by radiant heating from hot gases at 2000 °C with a heat flux of 45,000W/m2 . The convection heat transfer coefficient of hot gases inside the furnace is estimated to be is 15 W/(m2 K), the thermal conductance per unit area of the composite wall is 250 W/(m2 K), and there is convection at the outer surface of the furnace to the ambient air at T?. Sketch the thermal resistance circuit
for the heat transfer in this system, and calculate the total heat flow per unit area through the composite wall and the exterior wall surface temperature. Also if outside air temperature is T?=30°C, estimate the average convection heat transfer coefficient at the exterior surface.
GIVEN
FIND
(a) Draw the thermal circuit
(b) Rate of heat flow per unit area (q/A)
(c) The exterior surface temperature (Two)
(d) Average convection heat transfer coefficient at exterior surface.
ASSUMPTIONS
- Heat flow through the wall is one dimensional
- Steady state prevails
SKETCH
A monatomic ideal gas is compressed isobarically to one-third of its initial volume. The resulting pressure will be
A) three times as large as the initial value. B) equal to the initial value. C) more than three times as large as the initial value. D) equal to the initial value. E) impossible to predict on the basis of this data.
What is the maximum number of electrons that can occupy the g subshell?
A) 10 B) 14 C) 18 D) 22