In our Solar System, an object is called a planet if
A. it has cleared its neighborhood.
B. it is spherical.
C. it orbits the Sun.
D. All of these choices are correct.
Answer: D
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Consider a pin fin with variable conductivity k(T), constant cross sectional area Ac and constant perimeter, P. Develop the difference equations for steady one-dimensional conduction in the fin and suggest a method for solving the equations. The fin is exposed to ambient temperature Ta through a heat transfer coefficient h. The fin tip is insulated and the fin root is at temperature To.
GIVEN
• Fin with variable thermal conductivity, k(T)
FIND
(a) Difference equation (b) Solution method
SKETCH
A 10,000-kg rocket blasts off from earth with a uniform upward acceleration of 2.00 m/s2 and feels no air resistance. The upward thrust force its engines must provide during this acceleration is closest to
A) 20,000 N. B) 980,000 N. C) 118,000 N. D) 78,000 N.
Contrast the compositions and heights of the clouds of Earth and Venus
What will be an ideal response?
A polarizer (with its preferred direction rotated 30° to the vertical) is placed in a beam of unpolarized light of intensity 1. After passing through the polarizer, the beam's intensity is
A) 0.25. B) 0.50. C) 0.63. D) 0.87. E) 0.75.