As a 6 solar-mass star leaves the main sequence on its way to becoming a red supergiant, its luminosity
A) remains roughly constant.
B) decreases.
C) first increases, then decreases.
D) increases.
E) first decreases, then increases.
A
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Determine the steady-state temperatures of two radiation shields placed in the evacuated space between two infinite planes at temperatures of 555 K and 278 K. The emissivity of all surfaces is 0.8.
GIVEN
-Two radiant shields placed in the evacuated space between two infinite planes
-Temperature of the planes
-T1 = 555 K
-T4 = 278 K
-Emissivity of all surface (?) = 0.8
FIND
-The steady state temperatures of the shields (T2, T3)
ASSUMPTIONS
• All surfaces are gray and diffuse
SKETCH
The aircraft that generates a shock wave will fly at
1) half the speed of sound. 2) exactly the speed of sound. 3) twice the speed of sound. 4) all of these. A sonic boom is produced by a missile traveling 5) near the speed of sound. 6) at the speed of sound. 7) only above the speed of sound. 8) near, at, or above the speed of sound.
An astronomical telescope is made with lenses of focal lengths 80.0 and 1.25 cm. What magnifying power does this telescope provide?
A. 10 B. 81 C. 79 D. 64 E. 41
A majorette takes two batons and fastens them together in the middle at right angles to make an "x" shape. Each baton was 0.90 m long and each ball on the end is 0.20 kg. (Ignore the mass of the rods.) What is the moment of inertia if the arrangement is spun around an axis through the center perpendicular to both rods?
a. 0.064 kg•m2 c. 0.075 kg•m2 b. 0.096 kg•m2 d. 0.16 kg•m2