Gravitational Force Between Planets

AI Thread Summary
The gravitational force between a 21.2 kg lead ball and a 442 g lead ball, separated by 10.38 cm, is calculated to be 5.8 x 10^-8 N using the formula Gm1m2/r^2. To find the ratio of this gravitational force to the weight of the 442 g ball, one must first convert the mass of the ball into weight in Newtons. The weight is calculated by multiplying the mass by the acceleration due to gravity. The ratio is then obtained by dividing the gravitational force by the weight of the 442 g ball. Understanding these calculations is essential for solving the problem effectively.
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Homework Statement


Part 1)
The centers of a 21.2 kg lead ball and a 442 g lead ball are separated by 10.38 cm. What gravitational force does each exert on the other?

Part 2)
What is the ratio of this gravitational force to the weight of the 442 g ball?

The Attempt at a Solution



I found part 1 - 5.8 X 10^-8 N by using the formula Gm1m2/r^2.
Part 2 I haven't the slightest idea. Does anyone know how to find the ratio?

Thanks in advance.
 
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To find a ratio of gravitational force to the weight of the 442 g ball, it is simply the gravitational force divided by the weight of the ball.
 
So simple and yet I couldn't get it! Thank you.
 
remember to convert 442g, a mass, into a weight in Newtons (on Earth I presume).
 

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