Rainfall associated with an advancing cold front is generally
A) drizzly.
B) heavy with gusty winds.
C) slow and steady.
D) light to moderate, with steady mild winds.
Answer: B
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A shoe on an inclined surface barely remains at rest when friction equals the
A) weight mg of the shoe. B) component of mg perpendicular to the surface. C) component of mg parallel to the surface. D) none of the above
Compare the rate of heat flow from the bottom to the top in the aluminum structure shown in the sketch below with the rate of heat flow through a solid slab. The top is at –10°C, the bottom at 0°C. The holes are filled with insulation which does not conduct heat appreciably.
GIVEN
The aluminum structure shown in the sketch below
Temperature of the top (TT) = – 10°C
Temperature of the bottom (TB) = 0°C
The holes are filled with insulation which does not conduct heat appreciably
FIND
Compare the rate of heat flow from the bottom to the top with the rate of heat flow through a solid slab
ASSUMPTIONS
Compare the rate of heat flow from the bottom to the top with the rate of heat flow through a solid slab
ASSUMPTIONS
The structure is in steady state
Heat transfer through the insulation is negligible
The thermal conductivity of the aluminum is uniform
The edges of the structure are insulated
Two dimensional conduction through the structure
SKETCH
Silver solder
(a) At what temperature does the first solid form, and what is the chemical composition of this first solid to form?
(b) At what temperature does the alloy completely transform to a solid; what phases are present after the alloy is completely solid, and what are their chemical compositions at the transformation temperature?
(c) At room temperature, what is the atom fraction of each phase present?
How do asteroids differ from comets?
A) Asteroids are rocky bodies and are denser than the comets, which are made of icy material.
B) Asteroids are rocky bodies and are less dense than the comets, which are made of icy material.
C) Asteroids are made of icy material and are denser than the comets, which are more rocky.
D) Asteroids are made of icy material and are less dense than the comets, which are rockier.
E) Asteroids and comets are both made of rocky and icy material, but asteroids are smaller in size than comets.