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Sladkaya [172]
3 years ago
15

  Our understanding of the atom has changed over time. Which idea that was once accepted is now considered scientifically inaccu

rate?  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.
Physics
2 answers:
Law Incorporation [45]3 years ago
8 0

The correct answer to the question is : B) An atom is a solid material.

EXPLANATION:

From Rutherford's alpha ray scattering experiment, we know that most of the spaces in an atom is empty.

It is so because most of the alpha particles in that scattering experiment had gone undeviated without any deflection by the positively charged nucleus.

Hence, atom can not be considered as a compact solid sphere.


liubo4ka [24]3 years ago
4 0

my sis just took the test the answer is

B.) An atom is solid material.

or An atom is a solid sphere.


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Answer:

6.5\; {\rm N}.

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When an object travel at a speed of v in a circle of radius r, the (centripetal) acceleration of that object would be a = (v^{2} / r).

In this question, the ball is travelling at v = 3\; {\rm m\cdot s^{-1}} in a circle of radius r = 1.8\; {\rm m}. The (centripetal) acceleration of this ball would be:

\begin{aligned} a &= \frac{v^{2}}{r} \\ &= \frac{(3\; {\rm m\cdot s^{-1}})^{2}}{1.8\; {\rm m}} \\ &= 5\; {\rm m\cdot s^{-2}}\end{aligned}.

By Newton's Laws of Motion, for an object of mass m, if the acceleration of that object is a, the net force on that object would be m\, a. Since the acceleration of this ball is a = 5\; {\rm m\cdot s^{-2}}, the net force on this ball would be:

\begin{aligned} F &= m\, a \\ &= 1.3\; {\rm kg} \times 5\; {\rm m\cdot s^{-2}} \\ &= 6.5\; {\rm N} \end{aligned}.

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monitta

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The rules for significant digits are:

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