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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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2 years ago
Ship A is 32 miles north of ship B and is sailing due south at 16 mph. Ship B is sailing due east at 12 mph. At what rate is the
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Answer:

\dfrac{dz}{dt} =-5.6\ mile/h

Explanation:

distance between ship A and B = 32 mile

Ship A velocity in south, dx/dt = -16 mph

Ship B is sailing toward east with speed, dy/st = 12 mph

time = 1 hour

rate of change of distance between them = ?

x be the distance travel after t time

X = 32 + x

Let distance between them be z

now, using Pythagoras theorem to calculate distance between ships after 1 hours

z² = x² + y²

z² = (32 + x)² + 12²

z² = (32 - 16)² + 12²

z = √400

z = 20 miles

now, calculation of rate of change of distnace

z² = (32 + x)² + y²

differentiating both side w.r.t. time

2 z \dfrac{dz}{dt} = 2(32+x)\dfrac{dx}{dt} + 2 y\dfrac{dy}{dt}

z \dfrac{dz}{dt} =(32-16)\dfrac{dx}{dt} +y\dfrac{dy}{dt}

20\times \dfrac{dz}{dt} =16\times (-16) +12\times 12

\dfrac{dz}{dt} =\dfrac{-112}{20}

\dfrac{dz}{dt} =-5.6\ mile/h

hence, the rate is the distance between them changing at the end of 1 hour is equal to \dfrac{dz}{dt} =-5.6\ mile/h

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