Law of Attraction Warning !

The hydrogen atom contains a proton and an electron seperated by about 5.0 x 10(-11) m. (the (-11) is supposed to be to the -11 power.)The mass of a proton is approx 1.7 x 10(-27) kg. (the (-27) means to the power of -27 also.) The mass of the electron is approx 9.0 x 10(-31)kg. (same thing as before(to the power)) The charge on a proton is 1.6 x 10(-19)C (same thing as before) and the charge on an electron is -1.6 x 10(-19) C.
Newton’s law of universal gravitation:
F(g)=(6.67 x 10(-11)power) x m1 x m2
(all this equation divided by r(2) (r squared)
Coulombs law:
F(e)=(9 x 10 (9) power) x q1 x q2
(all this equation divided by r(2) (r squared)
a) Use newtons law of universal gravitation to calculate the gravitational force between the electron and proton in the hydrogen atom.
b)Use Coulombs law to determine the force of attraction between the 2 particles.
c)Calculate the ratio between the electric force and the gravitational force. How import. are gravit. forces in this case?

Come on now this is a common sample problem to show you how the Coulomb force is so much LARGER than the gravitational force. You should do it yourself. It’s a matter a plugging in the Numbers in Coulomb’s Eq and then into Newton’s and forming a ratio.

It will show you that Gravitational forces are unimportant when calculation electrical forces between charged particles

Our galaxy, the Milky Way, contains approximately 4.02×10^11 stars with an average mass of 2.49×10^30 kg each. If the Andromeda Galaxy, our nearest neighbor, contains roughly the same number of stars and is 2.26×10^43 meters away, what is the gravitational force of attraction between the two galaxies?

I used the Law of Universal Gravitation.. but i’m getting different numbers everytime i punch them into my calculator.. please help?

Thanks!!

Assuming the average mass of stars in Andromeda is the same as the Milky Way
F = G(nm)^2R^2
F = 6.673 x 10^-11 x (4.02 x 10^11 x 2.49 x 10^30)^2/(2.26 x 10^43)^2 = 1.30 x 10^-13 N

Apparently, according to the law of universal gravitation, the force of attraction between two objects will drop to zero when the distance between them is infinite. In the equation g=Gmm/r(squared) r is in the denominator, so when the distance is infinite g should have no value.

Actually,

F=G*m1*m2/r^2

when r -> infinity,
then F-> 0

if r becomes infinity then definitely F will become zero since all other things involved(G,m1,m2) are finite.

But infinity is not equal to zero in this equation.
zero=1/(infinity)

Using the Universal Law of gravitation, what would happen to the force of gravity between two objects if A) the distance between them increases by 5-fold? B) What would happen to the force of attraction if the distance decreased by 5-fold? For full credit, you must give by what factor or proportion the change would occur.

F = GmM/r^2

r –> 5r
F ‘ –> GmM/(5r)^2 = GmM/25r^2 = F/25

r –> 1/5r
F ‘ –> GmM/(r/5)^2 = GmM/(1/25)r^2 = 25GmM/r^2 = 25F

Newton’s law of universal gravitation states that every particle in the Universe attracts every other particle. Write the exact mathematical expression for the force of attraction, and state in few words why this force of attraction is stronger between the moon and the earth than it is between you and your friend?
Thank you for answering my question! It made sense to me.

F = G (m1 . m2)/r^2

Since ‘G’ value is constant, I guess the reason here is my friend and I don’t have huge masses unlike moon and earth.

The hydrogen atom contains a proton and an electron seperated by about 5.0 x 10(-11) m. (the (-11) is supposed to be to the -11 power.)The mass of a proton is approx 1.7 x 10(-27) kg. (the (-27) means to the power of -27 also.) The mass of the electron is approx 9.0 x 10(-31)kg. (same thing as before(to the power)) The charge on a proton is 1.6 x 10(-19)C (same thing as before) and the charge on an electron is -1.6 x 10(-19) C.
Newton’s law of universal gravitation:
F(g)=(6.67 x 10(-11)power) x m1 x m2
(all this equation divided by r(2) (r squared)
Coulombs law:
F(e)=(9 x 10 (9) power) x q1 x q2
(all this equation divided by r(2) (r squared)
a) Use newtons law of universal gravitation to calculate the gravitational force between the electron and proton in the hydrogen atom.
b)Use Coulombs law to determine the force of attraction between the 2 particles.
c)Calculate the ratio between the electric force and the gravitational force. How import. are gravit. forces in this case?

Come on now this is a common sample problem to show you how the Coulomb force is so much LARGER than the gravitational force. You should do it yourself. It’s a matter a plugging in the Numbers in Coulomb’s Eq and then into Newton’s and forming a ratio.

It will show you that Gravitational forces are unimportant when calculation electrical forces between charged particles.

Consider 2 ordinary objects of mass 1 kg each and seperated by a distance of 1 meter. calculate the force between them using newtons universal law of gravitation. now consider 2 magnets of the same mass (1kg each) and seperated by the same distance (1 meter). now calculate the force between them.. theoretically these 2 forces must be equal but practically they are not coz the magnets themselves have have their own magnetic force of attraction. can u tell why?? does the law hold good for magnets??

They are not equal. They variates both over the inverted squared distance, but the gravitational force is F=(m1*m2)/μ*r^2 (F is force, m is pole strength, μ is the permeability of the intervening medium, r is the separation) and the gravitational force is F= -G*(m1*m2)/r^2 (G is the gravitational constant, m1 is the mass of the first object, m2 is the mass of the second object, r is the distance between objects). Indeed, those two forces have similarities in the formula, but they are distinct.

Here is where i guessed .the numbers are the words i guessed. correct me if i got it wrong: According to the law of gravitation, all matter 1.pulls on all other objects. You won’t notice the 2. Attraction between you and your pen because 3. Mass is 4. Unbalanced for small objects. Without the resistance from air, all objects fall with the same 5. Acceleration, due to gravity. The force of gravity acts 6. Downward while the 7. normal force acts 8. Upward. When you stand on level ground, the normal force is equal to your 9. Weight. You do not accelerate because the forces acting on you are 10. balanced. Before you start moving, your 11. Inertia must be overcome.
That’s 11 questions i had to figure out. Please correct me if any of these are incorrect. thanks

Those all look fine except number 4 is probably wrong. Here are suggestions to consider.

1 exerts a force of attraction
2 force
3 attraction
4 insignificant

I am tired and did science almost a year ago, so get a second opinion from someone else.

A) states the realtion of mass and distance to gravity
B) explains the curve of the moons path
C) explains how the moon effects the ocean tides
D) all of the above

Planets travel quickest at?
A)Apogee
B) perigee
C) points between Apogee and Perigee

If the masses of two objects increase, what happens to the force of attraction between the objects?

A) the force of attraction is canceled
B) the force of attractions decreases
C) the force of attraction increases

D
B
C

For question #2, see the links I sent you in your previous question, and this one for #1 and #3…

say there are 2 bodies A and B. suppose A and B are in contact. Then the distance between them becomes zero.
let the mass of one body be m1 and the other m2, the distance between them r = 0
then, according to the universal law of gravitation,
F(force of attraction) = G X m1 X m2 / r^2
= G X m1 X m2 / 0^2
= G X m1 X m2 / 0
= infinity (because (any number not equal to 0) / 0 = infinity)
so does this mean A attracts B with infinite force? but how is this possible?

It is not the distance between the surface of the objects that matters, but the distance between the objects center of mass. If your bodies A and B had an overall dimension of zero (i.e. black hole like singularities) then your reasoning would be valid. But in reality, the distance between the two bodies, even when they are touching, is radius of A plus radius of B (assuming they are both homogeneous spheres).
To figure out how much you weight right now, you are to assume that you are 6370 km from the center of the Earth, that is the "r" of the equation.

Like according to newtons law of universal gravitaion every object which possess certain mass attract other objects with a force(the gravitational pull), then why does this force arise, what causes this force to exist?

Every object, whether on the earth or on the Mars, attracts another object. This force of attraction is known as gravitational force. Every object is made up of molecules or atoms. Each of these atoms or molecules have nucleus inside it. Gravititional force is actually the force obtained from the nucleus of the atom.
As the mass of the object increases, more its gravititional force.

1. Every object attracts every other object with a gravitational force
2. The force of attraction between the Sun and the planets is magnetic
3. The line from the Sun to a planet sweeps out equal areas in equal intervals of time

4.The force exerted by the Sun on the planets equals the force the planets exert on the sun.
Which two?

Thanks!

(1) and (4) are relevant to Newton’s Laws
2 is completely wrong
3 involves Keplers Law

I need help. His law states: Every object attracts every other object with a force that for any two objects is directly proportional to the mass of each object. The greater the masses, the greater the force of attraction between them. help plz!

It’s hard to give a simple explanation.
How about, The bigger they are the harder they fall…
The more massive an object is, the more gravity it has.
Often gravitational forces are described thusly – imagine the fabric of the universe as a large rubber sheet. set a sphere in the center and observe how much the sheet is indented. The larger the sphere, the larger the indentation. Now add some smaller spheres, and as you might imagine, they are drawn toward the center.
Of course there’s a whole lot more to it, but you need some serious math to get a handle on the equations.

according to newtons law of universal gravitation, the force of attractionbetweenany two masses is directly related to the ?

F=Gm1m2/r^2
G=6.62*10^-11

according to newton’s law of universal gravitation, the force of attraction between any two masses is directly related to the:

a. product of the two masses
b. velocity of the two masses
c. distance between the two masses
d. sum of the two masses

a) product of the two masses.

it has nothing to do with velocity (well, sorta, depending on your interpretation of relativity, (mass’ dependence on velocity) but it doesn’t really. don’t worry yourself over it.

the force of gravity is also inversely proportional to the square of the distance between the masses. For future reference.