What is the Sun made of (by mass)?
A) 70% hydrogen, 28% helium, 2% other elements
B) 100% hydrogen and helium
C) 50% hydrogen, 25% helium, 25% other elements
D) 90% dark matter, 10% ordinary matter
A
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A mega-parsec is equivalent to
a. 3.26 light-years. b. 206,265 AU c. the age of our solar system d. a million parsecs. e. the diameter of the Milky Way galaxy.
The magnetic field due to the current in a long, straight wire is 8.0 ?T at a distance of 4.0 cm from the center of the wire. What is the current in the wire? (?0 = 4? × 10-7 T ? m/
A) A) 0.20 A B) 0.40 A C) 0.80 A D) 3.2 A E) 1.6 A
A Group 7A element would be most likely to form a covalent bond with elements of Group
a. 2A. b. 1A. c. 8A. d. 6A.
Write the governing equation and the necessary boundary conditions for the problem of a tapered wall as shown in Figure 2-53.
