# Physics (Online w/ no teacher)

posted by .

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) -

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) -

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) -

Thank you both!

## Similar Questions

1. ### Neutron star-universal gravitational problem

Hi, i'm having problem w/ this question...i've tried everything i know and i still don't get the right answer...here's the info they give: Consider a neutron star of mass M = 1.99e+30kg and a radius of R = 10 km. They ask 3 question...two …
2. ### physic

Neutron stars are extremely dense objects with a mass comparable to the mass of the sun but a radius of only several thousand meters. Consider a neutron star of mass M = 1.99e+030 kg and a radius of R = 10 km. g = 1.3279e12 m/s Assuming …
3. ### physics

The mass of a certain neutron star is 2.0 x 1030 kg and its radius is 6,000 m (6 km). What is the acceleration of gravity at the surface of this condensed, burned out star?
4. ### Physics

The mass of a certain neutron star is 5 × 10^30kg (2.5 solar masses) and its radius is 2000 m. What is the acceleration of gravity at the surface of this condensed, burned-out star?
5. ### Physics HELP!!

The mass of a certain neutron star is 3.0 1030 kg (1.5 solar masses) and its radius is 7550 m. What is the acceleration of gravity at the surface of this condensed, burned-out star?
6. ### Physics

The mass of a certain neutron star is 1 × 1031 kg (5 solar masses) and its radius is 5500 m. What is the acceleration of gravity at the surface of this condensed, burned-out star?
7. ### Physics

The mass of a certain neutron star is 1 × 1031 kg (5 solar masses) and its radius is 5500 m. What is the acceleration of gravity at the surface of this condensed, burned-out star?
8. ### physics

Assume that the mass of a neutron star is 1.5 times that of the Sun and the radius of the neutron star is 10 km. Ignore effects of Special Relativity. What is the approximate speed at which an object released from far away (at zero …
9. ### Chemistry

Neutron stars are composed of solid nuclear matter, primarily neutrons. Assume the radius of a neutron is approx. 1.0 x 10^-13 cm. Calculate the density of a neutron. [Hint: For a sphere V=(4/3) pi r^3. Assuming that a neutron star …
10. ### Physics Question

Find the escape speed from (a) the Sun, (b) a white dwarf star with one solar mass (same as the Sun) and radius 10,000 km, (c) a neutron star of 2.0 solar masses and radius of 10.0 km, and finally (d) a star with 2 solar masses and …

More Similar Questions