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
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.
Which element has the atomic number 9?
A) F B) Ne C) B D) Na E) Be
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.