certain neutron stars rotate at about 1.0 revolutions per second. If such a star has a raduis of 20km, what minimum mass must it have so that material on its surface doesnt fly off during the rapid rotation?(adsbygoogle = window.adsbygoogle || []).push({});

ive tried working out the centripetal acceleration, being 7.89 X10^8

then subbed into the equation, assuming that m=1:

ive made m=the material on the surface and given it a value of 1

M= mass of neutron star

G= gravity constant = 6.674 x 10^-11

F = GMm/r^2

the answer i got turned out to be 4.7322 x10^24kg

but a few of my friends got 2.236x10^24 kg

can anyone help please?

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# Homework Help: Centripetal acceleration

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