An atom consists of (check all that apply)
A. negatively charged protons in a nucleus orbited by positively charged electrons.
B. positively charged protons in a nucleus orbited by negatively charged neutrons.
C. electrons in a nucleus orbited by protons.
D. None of these choices are correct.
Ans: D. None of these choices are correct.
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Among discovered meteorites, we have found some with all the following origins except ________
A) being a fragment from the surface of the Moon B) being a fragment of a shattered asteroid C) being a fragment from the surface of Mars D) being a fragment from Comet Halley
About 85% by mass of Earth's core is composed of the element(s)
a. iron b. nickel c. oxygen. d. silicon. e. iron and nickel.
The speed of a particle moving in a circle 2.0 m in radius increases at the constant rate of 4.4 m/s2 . At an instant when the magnitude of the total acceleration is 6.0 m/s2, what is the speed of the particle?
a. 3.9 m/s b. 2.9 m/s c. 3.5 m/s d. 3.0 m/s e. 1.4 m/s
Of all the active galactic nuclei, the ________ is the most energetic
A) quasar B) giant elliptical C) radio lobe galaxy D) blazar E) Seyfert