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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Of all the active galactic nuclei, the ________ is the most energetic
A) quasar B) giant elliptical C) radio lobe galaxy D) blazar E) Seyfert
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