What is the Sun made of?
A) 100 percent hydrogen and helium
B) 50 percent hydrogen, 25 percent helium, 25 percent other elements
C) 70 percent helium, 28 percent hydrogen, 2 percent other elements
D) 70 percent hydrogen, 28 percent helium, 2 percent other elements
E) 98 percent hydrogen, 2 percent helium and other elements
D
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The dynamo effect is believed to produce the ____________________ of the sun
Fill in the blank(s) with correct word
Which element has the atomic number 9?
A) F B) Ne C) B D) Na E) Be
Protostars can be observed in
A) the Crab Nebula. B) the Andromeda Galaxy. C) the Orion Nebula. D) our Solar System. E) the Helix Nebula.
A particle with charge -40.0 nC is on the x axis at the point with coordinate x = 0. A second particle, with charge -20.0 nC, is on the x axis at x = 0.500 m. Is there a point at a finite distance where the electric field is zero?
1.Yes; it is to the left of x = 0. 2.Yes; it is between x = 0 and x = 0.500 m. 3.Yes; it is to the right of x = 0.500 m. 4.No.