The complete spectral classification of our Sun is ________
Fill in the blank(s) with correct word
G2V
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The heavier elements like iron and nickel are abundant on Earth's surface, and the silicates dominate at the center of Earth.
Answer the following statement true (T) or false (F)
Which of the following items would not be considered "dark matter" by astronomers?
A) basketballs B) black holes C) weakly interacting massive particles D) red giants E) people
The mass density of normal air is, at a particular temperature,
If the average molecular mass of air is 29.0 u, how many air molecules are in spherical balloon of radius 15.0 cm?
A. 
B. 
C. 
D. 
E. 
F. 
Rotational Kinetic Energy: A solid uniform sphere is rolling without slipping along a horizontal surface with a speed of 5.5 m/s when it starts up a ramp that makes an angle of 25° with the horizontal. What is the speed of the sphere after it has rolled 3.0 m up as measured along the surface of the ramp?
A. 4.0 m/s B. 8.0 m/s C. 1.9 m/s D. 2.2 m/s E. 3.5 m/s