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A hole, by definition, has nothing in it and so its mass is zero.

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Q: What is an effective mass of hole?
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Which has high mass but low volume?

A black hole, a neutron star, or a white dwarf.


Is there a constant for time at the center of mass of a planetoid and blackhole formation threshold?

Maksim A. Burakhovich absolute time: since time is relative where on Earth time goes slower than in space since gravitational field slows time down, i guess we could designate absolute time as time at the center of mass of the heaviest object in the Universe that's not a black hole or where the difference in mass between that object and the litest black hole in terms of mass in the Universe is infinitesimal.


What is the formula of center of gravity?

There is no such thing. Do you mean definition? If so, it is the point at which the mass of an object can be considered to be effective/concentrated.


Cloud the pendulum be changed to increase the period of the pendulum?

Yes. You can increase the period by moving the pendulum to a location where the gravitational force is weaker.Alternatively, you can increase the effective length of the pendulum. The pendulum may be of fixed length, but you can still increase its effective length by adding mass to any point below its centre of gravity.Yes. You can increase the period by moving the pendulum to a location where the gravitational force is weaker.Alternatively, you can increase the effective length of the pendulum. The pendulum may be of fixed length, but you can still increase its effective length by adding mass to any point below its centre of gravity.Yes. You can increase the period by moving the pendulum to a location where the gravitational force is weaker.Alternatively, you can increase the effective length of the pendulum. The pendulum may be of fixed length, but you can still increase its effective length by adding mass to any point below its centre of gravity.Yes. You can increase the period by moving the pendulum to a location where the gravitational force is weaker.Alternatively, you can increase the effective length of the pendulum. The pendulum may be of fixed length, but you can still increase its effective length by adding mass to any point below its centre of gravity.


What are the chances that the sun will turn into a blackhole?

Absolutely zero. Our Sun does not have enough mass to explode as a supernova and it is those details that are required to make a black hole.