Posted by **Raf** on Tuesday, October 18, 2011 at 2:52pm.

The universal law of gravitation determines the amount of force exerted by a constant mass (M) on another constant mass (m), separated by a distance (r), is given by the expression F = ( -GmM )/r^2

a) What mathematical expression characterises the instant rate of change of the force F in respect to the distance (r) separating the two masses moving towards each other?

I got dF/dt = 2GmM/r^3 dr/dt

b) What's the rate of change?

No idea what to do here, they don't give me any numbers.

## Answer This Question

## Related Questions

- Math - The universal law of gravitation determines the amount of force exerted ...
- calculus - newtons law of gravitation says that the magnitude F of the force ...
- Calc - Newton's Law of Gravitation says that the magnitude F of the force ...
- Calculus - Okay so I have the following question and I am totally stuck: Newton'...
- science - Newtonâ€™s law of universal gravitation is rep- resented by F=GMm r2 ...
- physics - 1. Two point charges are separated by 6 cm. The attractive force ...
- Algebra 1 Scientific Notation - Isaac newtons theory of universal gravitation ...
- Physics - I am really struggling with these 2 questions. Please help! 1)Mars has...
- physics - Proponents of astrology claim that the positions of the planets at the...
- Science check answer quick! - I really do not understand Number 7 Which of these...

More Related Questions