Here's some advice - when people take the time and effort to answer the question you asked, don't immediately accuse them of being wrong about the thing you already said you don't understand. It's foolish and a just a dick move in response to people going out of their way to help you.

not quite unfortunately https://en.wikipedia.org/wiki/Aquaplaning

One day, you could be in for an unpleasant surprise. This is why you should slow down when it rains.

It's a balancing act.

Water is not compressable, unlike air. When you put pressure behind the water, in the case of the marble ball, it simply moves the ball up out of the way. As the above comment says, it needs to be a very smooth matched set, both the ball and the pedestal have to match curves. This way the water is forced out evenly all the way around. Since you don't NEED the water to be super duper pressurized, the water doesn't spray out.

Here's one way of thinking about it: my pressure washer is 3000psi. When I put the nozzles on it, they spray super hard. If I take the nozzle off, that same water is merely flopping out of the end, looking like normal water out of a faucet. However, the more you constrict the opening, the more "spray-like" things get. The marble ball is the pressure washer without the nozzle. The water just flops out. But the more you force the opening to constrict, in this case by putting more and more weight on the ball to keep it from moving, then you will begin to see spraying, coming from the path of least resistance, likely an imperfection in the marble surface.

As for driving, Water splashes out from under the tires when you're going slow enough.

Speed up, thus increasing the forces acting on everything, and the water really doesn't like you being there.

If you take a garden hose and put your finger over the end, yes at full pressure water sprays everywhere.

Reduce the pressure both on your finger and in the hose, and the water no longer sprays out, it simply pushes your finger out of the way.

Depending on the tread depth, tyre pressure, weight of the vehicle, depth of the puddle, speed etc... Possibly not...

Why ask a question if you think you know better

Marble has a density of 0.098 lbs/in^3^. So a 500lb sphere has a volume of 500lb/.098lb/in^3^= 5102 in^3^. That gives a radius of (5102 in^3^ * (3/(4pi)))^(1/3)^= 10.68 in.

Let's say the bowl it sits in has 2/3 the radius. So 7.12in. That makes the enclosed surface area pi*( 7.12in) ^2^= 160in^2^. So 500lbs/160in^2^ = 3.14 psi. How fast do you think the water will spray out at 3.14 psi? Without any drag, out of an ideal nozzle, it would be 6.5mph. However, the pressure will actually be higher in the middle and tapers off to 0 at the edge thanks to the flow diverging and drag. So really the pressure drop at the opening is even smaller.

There's a lot of lifting area which means you don't actually need much pressure. You can lift entire buildings with large water bags.

Bigger marble, bigger hose. It's the same principle scaled up.

The variables in this equation are:

• Diameter of marble
• weight of marble
• diameter of "hose"
• water flow/pressure

Along with some friction outliers, these can be adjusted to find an equilibrium.

This one weighs 9 tons

https://en.wikipedia.org/wiki/File:Reaching_for_the_Stars.jpg

Pressure is measured across surface area. The same way buoyancy is measured by water displacement. A larger object has more surface area. 1 PSI of pressure won’t be very much if the object only has 1 square inch of surface. But it would be a lot of pressure if the object has 500 square inches. 30 PSI is enough to keep your car off the ground. A few PSI would be enough to lift a 500lb rock if the surfaces were prepared properly.

For every weight of ball (within a certain density limit. Won't work with a black hole, for instance) there's some pressure and volume of water that will balance the weight and size of the ball perfectly to create a thin layer around the entire surface. Once the ball becomes too dense, there's no volume/ pressure combo that would do the same (the weight would require too much pressure by volume of water, so it would either stop it or fly full force by while barely levitating the ball). But I don't think whatever density that would be is found in pressures you could find on earth

Lol

It’s all about the pressure; more weight needs more pressure but they tune the pressure to match the weight of the ball.