within a book on a desk, there are billions of forces pushing and pulling on all the molecules. why is it these forces never by chance add up to a net force in one direction, causing the book to accelerate "spontaneously" across the desk?

Answers

Answer 1

Answer: For exactly the same reason that all the molecules of air in the room, each one
moving at a random Gaussian-distributed speed in a random direction, never by
chance all wind up on one side of the room at the same time, leaving you to
suffocate with no air on the side where you are.

By the way, there are not billions of forces pushing and pulling on all the
molecules in the book, but we know what you mean.

The answer is in the behavior of large numbers of 'randomly distributed' things.
The behavior of any one of them is unpredictable, and completely up to chance
and the tea leaves. But the laws of Physics that lean on every molecule result
in a definite probability of how large numbers of them will behave.

The probability of the book levitating off the desk, or all the air in the room
moving to one side, is NOT zero. There is a definite probability, which can be
calculated, that either of those events will happen. But the number is so small
that it can safely be assumed to be zero, without significantly changing our
concept of what to expect in our daily life.

It's NOT correct to say that it CAN'T ever happen, but it's totally rational,
reasonable, pragmatic, and practical to live our lives as if it can never happen,
because the probability is so small.

Answer 2

Answer: Newton's law states that for every action there is an equal and opposite reaction. therefore as the book is pulled down (towards the desk) the desk is pushing up against the book with an equal force. (this goes for all forces

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( Pennfoster plz help ) Which of the following does not accurately describe the forces that exist with an atom? A. Electrons closer to the nucleus and electrons farther from the nucleus repel due to like charges. B. Electrons positioned farther away from the nucleus are less attracted to the nucleus than are electrons positioned closer to the nucleus. C. Electrons positioned closer to the nucleus have a greater attraction to the protons and are more likely to be discharged from the atom than electrons farther away. D. Electrons in an atom are attracted to the protons within the nucleus due to opposite charges.

Answers

I would say C i'm not 100% sure

Choice-C is nonsense.

Electrons positioned closer to the nucleus are closer to the protons in the nucleus and more strongly attracted to them. Therefore these electrons are LESS likely to be discharged from the atom than electrons farther away from the nucleus are.

What three forms of kinetic energy can a polyatomic molecule have?

Answers

When an object moves, it possesses kinetic energy. There are five types of kinetic energy - radiant, thermal, sound, electrical (light) and mechanical (motion). I would say that the three forms of kinetic energy a polyatomic molecule have are thermal, electrical and mechanical energy. Hope this answers the question. Have a nice day.

What is the energy of a photon whose frequency is 6.0 x 10^20?(h=6.63 x10^-34 j•s; 1 eV=1.06x10^-19 J)

A. 1.6 MeV

B. 2.5 MeV

C. 3.3 MeV

D. 4.8 MeV

Answers

Answer:

3.75 MeV

Explanation:

The energy of the photon can be given in terms of frequency as:

E = h * f

Where h = Planck's constant

The frequency of the photon is 6 * 10^20 Hz.

The energy (in Joules) is:

E = 6.63 x10^(-34) * 6 * 10^(20)

E = 39.78 * 10^(-14) J = 3.978 * 10^(-13) J

We are given that:

1 eV = 1.06 * 10^(-19) Joules

This means that 1 Joule will be:

1 J = 1 / (1.06 * 10^(-19)

1 J = 9.434 * 10^(18) eV

=> 3.978 * 10^(-13) J = 3.978 * 10^(-13) * 9.434 * 10^(18) = 3.75 * 10^(6) eV

This is the same as 3.75 MeV.

The correct answer is not in the options, but the closest to it is option C.

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Answers

Answer:

Explanation: The turnoff point for a star refers to the point on the Hertzsprung–Russell diagram where it leaves the main sequence after its main fuel is exhausted-the main sequence turnoff. HR diagrams for two open clusters, M67 and NGC 188, showing the main sequence turn-off at different ages.

Generators need a source of energy to produce electricity. Which form of energy is a nonrenewable source of energy?hydro (water) energy

geothermal energy

fossil fuel

wind energy

Answers

Non-renewable energy are the form of energy whose source cannot be recycled and are limited in numbers. Out of all the options, only fossil fuel is Non-renewable otherwise all of them are renewable and can be recycled.

In short, Your Answer would be Option C) Fossil Fuel

Hope this helps!

Your Answer Would Be Fossil Fuel. All Of The Rest Are Renewavle. Hope This Helps!

What is the wavelength of a sound wave that has a speed of 327 m/s and a frequency of 185 hz?

Answers

Wave speed = frequency * wavelength
We need to rearrange this so wavelength is the subject. To do this, divide both sides by frequency to get :
Wave speed / frequency = wavelength
327 / 185 = 1.7675 m

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