Our understanding of the atom has changed over time. which idea that was once accepted is now considered scientifically inaccurate? a. the nucleus is the center of the atom. b. an atom is solid material. c. electrons have a negative charge. d. electrons are arranged in layers.
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Aparticle's position is given by x = 3.00 - 9.00t + 3t2, in which x is in meters and t is in seconds. (a) what is its velocity at t = 1 s? (b) is it moving in the positive or negative direction of x just then? (c) what is its speed just then? (d) is the speed increasing or decreasing just then? (try answering the next two questions without further calculation.) (e) is there ever an instant when the velocity is zero? if so, give the time t; if not, answer "0". (f) is there a time after t = 3 s when the particle is moving in the negative direction of x? if so, give the time t; if not, answer "0".
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Our understanding of the atom has changed over time. which idea that was once accepted is now consid...
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