A lunar eclipse that occurs when the moon moves completely into Earth's umbral shadow is called
a. a total solar eclipse.
b. a partial solar eclipse.
c. an annular solar eclipse.
d. a penumbral lunar eclipse.
e. an umbral lunar eclipse.
E
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Develop the control volume difference equation for one-dimensional steady conduction in a in with variable cross-sectional area A(x) and perimeter P(x). The heat transfer coefficient from the fin to ambient is a constant oh and the fin tip is adiabatic.
GIVEN
• Fin with variable cross-sectional area and perimeter
• Convection coefficient to ambient is constant, ho
FIND (a) Control volume difference equation
SKETCH
Winter and summer differ in length on Mars because of its elliptical orbit
Indicate whether the statement is true or false
Which of these is NOT typical of the Galaxy's spiral arms?
A) open clusters B) Population II giants like orange Arcturus C) emission nebulae like M42 D) hot, young blue Population I stars E) O and B stars
A body oscillates with simple harmonic motion along the x axis. Its displacement varies with time according to the equation x = 5.0 cos (?t). The magnitude of the acceleration (in m/s2) of the body at t = 1.0 s is approximately
a. 3.5. b. 49. c. 14. d. 43. e. 4.3.