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.
jibjab
Messages
13
Reaction score
0

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.
 
Physics news on Phys.org
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).
 

Thread 'Errors and significant figures'

I multiplied the values first without the error limit. Got 19.38. rounded it off to 2 significant figures since the given data has 2 significant figures. So = 19. For error I used the above formula. It comes out about 1.48. Now my question is. Should I write the answer as 19±1.5 (rounding 1.48 to 2 significant figures) OR should I write it as 19±1. So in short, should the error have same number of significant figures as the mean value or should it have the same number of decimal places as...
View full post »
Thread 'Collision of a bullet on a rod-string system: query'

Thread 'Collision of a bullet on a rod-string system: query'

In this question, I have a question. I am NOT trying to solve it, but it is just a conceptual question. Consider the point on the rod, which connects the string and the rod. My question: just before and after the collision, is ANGULAR momentum CONSERVED about this point? Lets call the point which connects the string and rod as P. Why am I asking this? : it is clear from the scenario that the point of concern, which connects the string and the rod, moves in a circular path due to the string...
View full post »
Thread 'A cylinder connected to a hanging mass'

Thread 'A cylinder connected to a hanging mass'

Let's declare that for the cylinder, mass = M = 10 kg Radius = R = 4 m For the wall and the floor, Friction coeff = ##\mu## = 0.5 For the hanging mass, mass = m = 11 kg First, we divide the force according to their respective plane (x and y thing, correct me if I'm wrong) and according to which, cylinder or the hanging mass, they're working on. Force on the hanging mass $$mg - T = ma$$ Force(Cylinder) on y $$N_f + f_w - Mg = 0$$ Force(Cylinder) on x $$T + f_f - N_w = Ma$$ There's also...
View full post »

Similar threads

Calculate the gravitational force exerted on a 5.00 kg baby
Replies
2
Views
2K
Determine the mass of the planet using Newton’s Law of Universal Gravitation
Replies
2
Views
3K
Find the attractive force of gravity between two objects
Replies
8
Views
2K
Ratio of the Magnitude of gravitational force?
Replies
5
Views
5K
Gravitational Potential Energy questions near the surface of a planet
Replies
8
Views
2K
Gravitational Force Problem - Help
Replies
6
Views
2K
Introductory Physics - Finding "little g"
Replies
5
Views
3K
Gravitational force between objects
Replies
11
Views
3K
Gravitation - gravity force, centripetal aceleration, work
Replies
6
Views
1K
Gravitational force of a basketball to a golf ball
Replies
4
Views
4K

Hot Threads

Recent Insights

Back
Top