What determines the identity of a chemical element?
A. the number of protons in the nucleus
B. the number of neutrons in the nucleus
C. the number of electrons orbiting the nucleus
D. All of these choices are correct.
Answer: A
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Suppose we represent Earth with a basketball. On this scale, most of the air in Earth's atmosphere would fit in a layer that is ________
A) about an inch thick B) about 6 inches thick C) about the thickness of a sheet of paper D) about a half-inch thick
A particle moves in the xy plane with a constant acceleration given by 
m/s2. At t = 0, its position and velocity are 
m and
src="https://sciemce.com/media/2/ppg__cognero__Chapter_4_Two_and_Three_Dimensional_Motion.__media__b88562d4-679d-415b-8c57-03705e7a29d7.PNG" style="vertical-align:middle;" /> m/s, respectively. What is the distance from the origin to the particle at t = 2.0 s? A. 6.4 m B. 10 m C. 8.9 m D. 2.0 m E. 6.2 m
Relate sunspots and prominences
What will be an ideal response?
Why can't we send a space mission to a star system outside of our own?
What will be an ideal response?