# 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 of which i have answered (1st:gravitional acceleration near the surface of the star, i found to be 1.33e12 m/s/s and 2nd: found the velocity of an object if it was 1.1 m away from the surface of the star to be 1.71e6 m/s.) but the question that i haven't been able to answer is this: Assuming uniform density, how much would 1.1 cubic centimeters of neutron star material weigh on the surface of the earth?

HELP!!!....i got this far..desity of the star w/ radius 10 km..1.99e+30kg/4.19e12 (meters cubed) = x (kg)/1e-6 (meters cubed) and then the answer from that i multiplied by 9.81...but that's not the right answer...what am i doing wrong??

sorry i finally found the answer...i just made some errors in the unit conversion

## No problem! It's great to hear that you found the answer. Unit conversion can sometimes be tricky, but once you get the hang of it, it becomes easier. Here's a step-by-step explanation of how to solve the problem correctly:

1. Start with the given information: Mass of the neutron star, M = 1.99e+30 kg and Radius, R = 10 km.

2. Calculate the volume of the neutron star: Since the neutron star is assumed to have uniform density, you can use the formula for the volume of a sphere, i.e., V = (4/3)πR^3. Convert the radius from kilometers to meters by multiplying by 1000, i.e., 10 km = 10,000 m. Plug in the values and calculate the volume.

3. Find the density of the neutron star: Divide the mass of the neutron star by its volume. Convert the volume from cubic meters to cubic centimeters by multiplying by 1e6.

Density = M (kg) / V (cm^3)

4. Calculate the weight of 1.1 cubic centimeters of neutron star material on Earth: Multiply the density by the volume in cubic centimeters and then multiply by the acceleration due to gravity on Earth.

Weight = Density (kg/cm^3) * Volume (cm^3) * Acceleration due to gravity (m/s^2)

Make sure to keep track of your units and perform the necessary conversions. Double-check each step to ensure accuracy.

If you encounter any other questions or need further assistance, feel free to ask!