We say that the matter in the Sun's interior is a plasma, which mean it is
A) a low-density gas.
B) an ionized gas.
C) a thick liquid, like blood.
D) a freely flowing liquid, like water.
E) a very hot but electrically neutral gas.
B) an ionized gas.
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Determine the temperature distribution and heat flow rate per meter length in a long concrete block having the shape shown below. The cross-sectional area of the block is square and the hole is centered.
GIVEN
A long concrete block having the shape shown below
The cross-sectional area of the block is square
The hole is centered
FIND
(a) The temperature distribution in the block
(b) The heat flow rate per meter length
ASSUMPTIONS
The heat flow is two dimensional and in steady state
The thermal conductivity in the block is uniform
SKETCH
If the mass of an object were doubled while its volume remained the same, its density would
A) be half. B) double. C) stay the same. D) be four times as great.
A bat is flying toward a cave wall. If it hears reflected sound of frequency 60.9 kHz, what is its flying speed, assuming it emits sound at 52.0 kHz? The speed of sound is 341.5 m/s.
A. 25.9 m/s B. 28.1 m/s C. 49.9 m/s D. 26.9 m/s E. 58.4 m/s
If you hold a shiny spherical Christmas tree ornament at arm's length and look at your reflection, the image is
A. upright and enlarged.
B. upright and reduced.
C. inverted and enlarged.
D. inverted and reduced.
