How Much Does Neutron Star Material Weigh on Earth?

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In summary, the conversation discusses the process of converting mass to weight and specifically focuses on calculating the weight of 1.1 cubic centimeters of material from a neutron star on the surface of the earth. The conversation uses equations for volume, density, and gravity to arrive at a final answer of 7.0323e16 N.
  • #1
danimal8f
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Basic mass to weigh conversion?

Consider a neutron star of mass M = 1.99e+030 kg and a radius of R = 9 km.
Assuming uniform density, how much would 1.1 cubic centimeters of neutron star material weigh on the surface of the earth?

Homework Equations


Volume of Sphere = (4/3)pi(r^3)
density = Mass/Volume
gravity = 9.81 m/s^2

First I converted 9km to 9000m, and 1.1cm^3 to .011m^3
solve for density; (M=1.99e30)/(vol=(4/3)pi(9000^3) = 6.5168e17

(.011 x 6.5168e17) x 9.81 = 7.0323e16 N

its not accepting my answer
 
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  • #2


danimal8f said:
Consider a neutron star of mass M = 1.99e+030 kg and a radius of R = 9 km.
Assuming uniform density, how much would 1.1 cubic centimeters of neutron star material weigh on the surface of the earth?

Homework Equations


Volume of Sphere = (4/3)pi(r^3)
density = Mass/Volume
gravity = 9.81 m/s^2

First I converted 9km to 9000m, and 1.1cm^3 to .011m^3
solve for density; (M=1.99e30)/(vol=(4/3)pi(9000^3) = 6.5168e17

(.011 x 6.5168e17) x 9.81 = 7.0323e16 N

its not accepting my answer

Welcome to PF.

Maybe you want to check that conversion?
 
  • #3


why thank you... I'm an idiot
 
Last edited:

What is the difference between mass and weight?

Mass is a measure of the amount of matter in an object, while weight is a measure of the force of gravity on an object. Mass is constant, while weight can change depending on the gravitational pull of the object's location.

What is the standard unit of mass and weight?

The standard unit of mass is kilograms (kg), while the standard unit of weight is newtons (N).

How do I convert mass to weight?

To convert mass to weight, you can use the formula W = m x g, where W is the weight in newtons, m is the mass in kilograms, and g is the gravitational acceleration (9.8 m/s² on Earth).

What is the conversion factor for converting mass to weight?

The conversion factor for converting mass to weight is 9.8 m/s², which is the gravitational acceleration on Earth. This means that for every 1 kg of mass, the weight is 9.8 N.

Can mass and weight be measured using the same unit?

No, mass and weight cannot be measured using the same unit. Mass is measured in kilograms (kg), while weight is measured in newtons (N).

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