Weighted ping-pong balls can fall endlessly through a granular medium (w/ video)

For example, for a ping-pong-ball-sized object to achieve a terminal velocity when impacting sand, the object would have to have a mass of about 14 kg (for a density of 400 g/cm3). No known material ... 19 hours ago Hi, I'm having a strangely hard time ...- Eureka #25: Volume ... solve problems. mass - the amount of matter in an object; measured in this experiment with grams (g) volume - the amount of space an object takes up; measured in this experiment with cubic centimeters (cm3). density - the ratio ...
A Black Hole without a Singularity

A neutron star is an object that’s about the mass ... You make a star the mass of the Sun out of those, and do you know what happens? Your density goes up, and your volume goes down. If you’re suddenly smaller than a neutron star, it only makes sense ...- But it looks for all the world – or worlds — like some small object on an inclined orbit has punched through ... I would think that even in Saturn’s ring, the density of particles wouldn’t be enough to support a phenomenon like this.
What is the universe expanding into?

Either the Universe is infinite, going on forever, or its finite, with a limited volume. In either case ... Your 2-dimensional ant brain can't comprehend an expanding 3-dimensional object. There may be a center to the balloon, but there's no center ...

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