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The gravitational attraction between two masses is

F = G M1 M2/R2

For this exercise,

M1 = 8 kg

M2 = 4 kg

R = 0.5 km = 500 meters

and 'G' is the universal gravitational constant, G = 6.67 x 10-11

F = (6.67 x 10-11) (8)x(4)/(500)2 = 8.5376 x 10-15 = 0.000 000 000 000 0085376 newton

That's about 3.071 x 10-14 ounce (0.000 000 000 000 03071 ounce)

Q: What is the force of attraction between 8 kg and 4 kg mass separated bt 0.5 km?

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Matter is bound energy displacing space, the volume and density of displacement is the mass of the matter involved. Gravity is the attraction between matter displacing space, weight is measure of the force exerted by matter due to its gravitational attraction. Therefore the atomic mass of a collection of matter defines the gravitational attraction that matter will exert which will define the measurable weight of the matter in question.

The mass of each object and the distance between their centers of mass

F = G m1m2/R2F = the mutual gravitational force of attraction between two massesG = the universal gravitational proportionality constantm1, m2 = the masses of the two massesR = the distance between the centers of mass of the two masses

If the mass is already moving, then no force is required to move it any desired distance,and if it's not moving, then any force will start it moving. We'll say that there's no definiterelationship between force, mass, and distance.

No. The relationship is: weight = mass x gravity Mass causes both weight, and inertia. Weight is the force of attraction by gravity, and also depends on the gravitational field, not just on the mass. For more information, check the Wikipedia article "Mass versus weight".

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A force of attraction between two separated masses. A single mass also has a scalar gravitational potential field around it.

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The force between two objects is directly proportional to the product of their masses. This is described by Newton's law of universal gravitation, which states that the force of attraction between two objects is determined by their masses and the distance between them. The greater the mass of the objects, the stronger the force of attraction between them.

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