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bonufazy [111]
3 years ago
7

1. In Bohr's model of the atom, where are the electrons and protons located? (1 point)

Physics
1 answer:
r-ruslan [8.4K]3 years ago
5 0
Well, it's really dangerous to try and visualize physical models for things
of this size.  But if you must, then it's something like this:

-- The nucleus is a tight-packed bunch of protons and neutrons, located
at the center of each atom.

-- The electrons live all around the nucleus, in a space far from it. 
A description of the relative sizes that I read more than 60 years ago
and always stuck with me goes like this:   The nucleus in the middle
and the electrons whizzing around it have a size-relationship that's
about the same as a bunch of grapes in the middle of the state of Texas.

This also tells us that matter is mostly empty space ! 

-- In Bohr's model of the atom, he described the whole thing very much
like a miniature solar system ... the electrons are tiny, solid little balls,
orbiting the nucleus like planets around the sun.

We learned later that it's impossible to talk about things like "how big is
the electron" or "where is the electron" or "how much momentum does
the electron have".  The best we can do is talk about a 'cloud' around the
nucleus ... it has some mass and some negative charge, and portions
of it somehow exist at different levels of energy, and can jump to
different levels.     

This is NOT because we don't have good enough technology yet to
zoom in on the electrons, and at some time in the future we'll be able
to sharply see where they are and how fast they're moving.  It's because
on the scale of atomic dimensions, there is NO SUCH THING as "where
is it" or "how big is it" or "how fast is it moving".    These don't exist. 
"Location" is described in terms of probability, objects behave like solid
waves, and an object can have this much energy or that much energy
but NO AMOUNT OF ENERGY IN BETWEEN.   
Weird ?     Hard to understand ?     You said it !

BTW ... the answer to the question is ' A ' .
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puteri [66]
I guess it's found below the horizon? maybe. or it could be B.
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ECONOMICS !!!!
gulaghasi [49]

Answer:

B

Explanation:

Absolute advantage is the capability of a commercial entity to produce goods using fewer resources compared to rivals. Using the same inputs, an entity with an absolute advantage produces a larger output compared to competitors. It means the firm has a lower marginal cost of production. Therefore, its products will have the lowest prices in the market.  

6 0
3 years ago
The following objects have velocity and mass as given: Object A: m=5 kg, ⃗v=−11 ^j Object B: m=6 kg, ⃗v=5^ i +8.7 ^ j Object C:
Fofino [41]

Answer:

For object A

m = 5 kg ,   v= -11 j

For B object

m = 6 kg  ,  v= 5 i +8.7 j

For object C

m = 10 kg   ,   v= -10 i

We know that

Linear momentum   P= m v   kg.m/s

a) A and C

Momentum in y direction

Py=- 5 x 11 j= - 55 j  kg.m/s

Momentum in x direction

Px=- 10 x 10 j= - 100 i    kg.m/s

b) B and C

Momentum in y direction

Py=6 x 8.7 j= 52.2 j    kg.m/s

Momentum in x direction

Px=( 6 x 5 - 10 x 10 ) i = - 70 i   kg.m/s

c) A ,B and C

By using data of a and b

Momentum in y direction

Py= 6 x 8.7 - 5 x 11 j= -2.8 j    kg.m/s

Momentum in x direction

Px=  6 x 5 -10 x 10 i = -70 i   kg.m/s

4 0
3 years ago
A bicycle rider has a speed of 20.0 m/s at a height of 60 m above sea level when he begins coasting down hill. Sea level is the
IRINA_888 [86]

Answer:

The rider's speed will be approximately 35 m/s

Explanation:

Initially the rider has kinetic and potential energy, and after going down the hill, some of the potencial energy turns into kinetic energy. So using the conservation of energy, we have that:

kinetic_1 + potencial_1 = kinetic_2 + potencial_2

The kinetic and potencial energy are given by:

kinetic = mass * speed^2 / 2

potencial = mass * gravity * height

So we have that:

m*v^2/2 + mgh = m*v'^2/2 + mgh'

20^2/2 + 9.81*60 = v'^2/2 + 9.81*18

v'^2/2 + 176.58 = 788.6

v'^2/2 = 612.02

v'^2 = 1224.04

v' = 34.99\ m/s

So the rider's speed will be approximately 35 m/s

8 0
3 years ago
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