Homework Help: Physics (Online w/ no teacher)

Posted by Katie on Monday, October 27, 2008 at 8:50am.

The mass of a certain neutron star is 3.0 X 10 to the 30th (1.5 solar masses) and its radius is 8,000 m (8 km). What is the acceleration of gravity at the surface of this condensed, burned-out star?

My answer was 31,265,625 X 10 to the 12th km/s squared.

Physics (Online w/ no teacher) - bobpursley, Monday, October 27, 2008 at 9:55am
F/m= GM/r^2= 6.67E-11 * 3.0E30/64E6 m/s^2
= yes, you are correct, except your number of significant digits is far excessive.
Physics (Online w/ no teacher) - drwls, Monday, October 27, 2008 at 9:57am
The answer is G M/R^2, where G is the universal constant of gravity,
6.67*10^-11 N m^2/kg^2.

You missed the decimal point by a very wide margin, and you have too many significant figures.

The correct answer is 3.1*10^12 m/s^2
Physics (Online w/ no teacher) - Katie, Monday, October 27, 2008 at 10:19am
Thank you both!

Answer this Question

Related Questions

Physics HELP!! - The mass of a certain neutron star is 3.0 1030 kg (1.5 solar ...
Physics - The mass of a certain neutron star is 5 × 10^30kg (2.5 solar ...
Physics - The mass of a certain neutron star is 1 × 1031 kg (5 solar ...
Physics - The mass of a certain neutron star is 1 × 1031 kg (5 solar ...
physic - Neutron stars are extremely dense objects with a mass comparable to the...
physics - The mass of a certain neutron star is 2.0 x 1030 kg and its radius is ...
chemistry - assuming that a neutron star has the same density as a neutron, ...
physics - The volume of a neutron is about 10−45 cubic meters. Suppose...
Physics - Neutron stars consist only of neutrons and have unbelievably high ...
physics (Newton's Law of gravitation) - I need help with this question until...

For Further Reading

First Name:
School Subject:
Answer: