The interior layer just below the crust of Earth is called the ________.
A. inner core
B. mantle
C. troposphere
D. outer core
Answer: B
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A planetary nebula is a(n) ____
a. expanding envelope of ionized gas expelled by a dying medium-mass star b. expanding envelope of neutral gas and dust expelled by a dying medium-mass star c. contracting envelope of dusty material from planets destroyed by a dying medium-mass star d. contracting envelope of ionized interstellar medium absorbed by a dying medium-mass star e. expanding atmosphere of a medium-mass star as it becomes a red giant
A windowpane is half a centimeter thick and has an area of 2.0 m2 . The temperature difference between the inside and outside surfaces of the pane is 15°C. What is the rate of heat flow through this window? (Thermal conductivity for this glass is 0.84 W / m •°C.)
a. 5000 J/s c. 1300 J/s b. 2500 J/s d. 630 J/s
The lowest mass object that can initiate thermonuclear fusion of hydrogen has a mass of about
a. 1 solar masses b. 80 solar masses c. 8 solar masses d. 0.08 solar masses e. 0.001 solar masses
At a particular point and instant, the magnetic field component of an electromagnetic wave is 15.0 ?T. What is the magnetic energy density of this wave at that point and instant?
(c = 3.00 × 108 m/s, ?0 = 4? × 10-7 T ? m/A, ?0 = 8.85 × 10-12 C2/N ? m2 ) A) 4.47 × 10-4 J/m3 B) 9.72 × 10-5 J/m3 C) 2.26 × 10-4 J/m3 D) 8.95 × 10-5 J/m3 E) 1.79 × 10-4 J/m3