When Philadelphia's temperature is 40°F and Miami's temperature is 80°F,
A) Miami is twice as hot as Philadelphia.
B) Miami is warmer than Philadelphia.
C) both of these
D) neither of these
Answer: B
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The greatest variation in size, mass, and luminosity occurs in
A) globular clusters. B) elliptical galaxies. C) spiral and barred spiral galaxies. D) type I vs type II irregulars. E) Seyfert galaxies.
A very thin uniform rod, 2.40 m long and of weight 135 N, has a frictionless hinge at its lower end
It starts out vertically from rest and falls, pivoting about the hinge. Just as it has rotated through an angle of 55.0°, what is the downward acceleration of the end farthest from the hinge? A) 5.02 m/s2 B) 8.03 m/s2 C) 9.80 m/s2 D) 12.0 m/s2 E) 19.6 m/s2
A plane wall of thickness 2L has internal heat sources whose strength varies according to 0q is the heat generated per unit volume at the center of the wall (x = 0) and a is a constant. If both sides of the wall are maintained at a constant temperature of Tw, derive an expression for the total heat loss from the wall per unit surface area.
GIVEN
A plane wall with internal heat sources Heat source strength: q
Gcos (ax) Wall surface temperatures = Tw Wall thickness = 2L
FIND
An expression for the total heat loss per unit area (q/A)
ASSUMPTIONS
Steady state conditions prevail
The thermal conductivity of the wall (k) is constant
One dimensional conduction within the wall
SKETCH
Io's internal heat is due to tidal interactions with Jupiter and Europa
Indicate whether the statement is true or false