Sun's rotational speed

If the Sun was compressed down to the size of the Earth how fast would
its rotational speed be? Bert

When the sun becomes a white dwarf will this make its magnetic field
stronger since it is spinning so much faster. Bert

When the sun becomes a white dwarf will this make its magnetic field
stronger since it is spinning so much faster. Bert

(G=EMC^2 Glazier) wrote in message ...
If the Sun was compressed down to the size of the Earth how fast would
its rotational speed be? Bert

Assuming no angular momentum was exchanged or changed in the process,
the "compressed" sun would rotate 109.12 times faster than it does
now, or about one revolution every 5.9989 hours.
--
David W. Knisely
Prairie Astronomy Club: http://www.prairieastronomyclub.org
Hyde Memorial Observatory: http://www.hydeobservatory.info/

**********************************************
* Attend the 11th Annual NEBRASKA STAR PARTY *
* July 18-23, 2004, Merritt Reservoir *
* http://www.NebraskaStarParty.org *
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(G=EMC^2 Glazier) wrote in message ...
If the Sun was compressed down to the size of the Earth how fast would
its rotational speed be? Bert

Assuming no angular momentum was exchanged or changed in the process,
the "compressed" sun would rotate 109.12 times faster than it does
now, or about one revolution every 5.9989 hours.
--
David W. Knisely
Prairie Astronomy Club: http://www.prairieastronomyclub.org
Hyde Memorial Observatory: http://www.hydeobservatory.info/

**********************************************
* Attend the 11th Annual NEBRASKA STAR PARTY *
* July 18-23, 2004, Merritt Reservoir *
* http://www.NebraskaStarParty.org *
**********************************************

"David Knisely" wrote in message
. ..
(G=EMC^2 Glazier) wrote in message
...
If the Sun was compressed down to the size of the Earth how fast would
its rotational speed be? Bert

Assuming no angular momentum was exchanged or changed in the process,
the "compressed" sun would rotate 109.12 times faster than it does
now, or about one revolution every 5.9989 hours.

The moment of inertia of a sphere is proportional to M*R^2,
so wouldn't the ratio be (Rsun/Rearth)^2? That would be
in the neighbourhood of 12000x current rotation speed, or
about 180 seconds per revolution.

"David Knisely" wrote in message
. ..
(G=EMC^2 Glazier) wrote in message
...
If the Sun was compressed down to the size of the Earth how fast would
its rotational speed be? Bert

Assuming no angular momentum was exchanged or changed in the process,
the "compressed" sun would rotate 109.12 times faster than it does
now, or about one revolution every 5.9989 hours.

The moment of inertia of a sphere is proportional to M*R^2,
so wouldn't the ratio be (Rsun/Rearth)^2? That would be
in the neighbourhood of 12000x current rotation speed, or
about 180 seconds per revolution.

David it is nice to know we have an equation to figure that out. When a
gas planet,or star gets smaller its like an ice skater bringing in their
arms(conservation or angular motion) I used the shrinking of the sun to
the size of the Earth,because I had a gut feeling its speed would be
very close to Jupiter's spin speed and it is. It is no wonder why
pulsars(neutron stars) spin so fast,and using this equation blackholes
can spin possibly 3 times faster that neutron stars. Bert

David it is nice to know we have an equation to figure that out. When a
gas planet,or star gets smaller its like an ice skater bringing in their
arms(conservation or angular motion) I used the shrinking of the sun to
the size of the Earth,because I had a gut feeling its speed would be
very close to Jupiter's spin speed and it is. It is no wonder why
pulsars(neutron stars) spin so fast,and using this equation blackholes
can spin possibly 3 times faster that neutron stars. Bert

(David Knisely) wrote in message ...
(G=EMC^2 Glazier) wrote in message ...
If the Sun was compressed down to the size of the Earth how fast would
its rotational speed be? Bert

Assuming no angular momentum was exchanged or changed in the process,
the "compressed" sun would rotate 109.12 times faster than it does
now, or about one revolution every 5.9989 hours.

Oops, forgot to hit the square key. The sun would be rotating
11,907.8 times faster than it does now, so it would be rotating in
about 3.3 *minutes* time.