Sunday, February 25, 2024

Creating liberating content

Windows 11 build 26063...

The operating system now supports Wi-Fi 7, which brings wireless speeds of...

Waymo’s application to expand...

Waymo’s application to expand its robotaxi service in Los Angeles and San...

Neuralink’s First Brain Implant...

Some Neuralink rivals, such as Precision Neuroscience, are developing implants that sit...
HomeTechnologyWhen You Drop...

When You Drop a Rock Overboard, What Happens to the Water Level?


Physics questions are the most fun when people don’t immediately agree on the answer. What feels intuitive or obvious—sometimes isn’t. We can argue over the solution for hours of entertainment, and we might even learn something in the end.

Here’s one of these seemingly obvious questions that’s been around a long time: Suppose a large rock is on a boat that is floating in a very small pond. If the rock is dumped overboard, will the water level of the pond rise, fall, or remain unchanged?

Go ahead and debate it with your friends and family. While you convince them that your answer is correct, here is a picture of my boat with a rock in it:

Photograph: Rhett Allain

OK, it’s not actually a boat, it’s part of a plastic bottle. Also, the “rock” is a lead weight and the “pond” is a beaker. But this way we can see what happens to the water level when we drop an object into it.

When a boat is floating on water, two forces are acting on it. First, there is the downward-pulling gravitational force, which is equal to the mass of the boat and everything on it (m) times the gravitational field (g = 9.8 newtons per kilogram). We often call this product the “weight.”

The other force is the upward-pushing buoyancy interaction with the water. Two things are true about this buoyancy force. First, if the boat is floating, then the upward buoyancy must be equal to the weight of the boat. Second, the buoyancy force is equal to the weight of the water displaced by the boat.

We can calculate this buoyancy force by taking the volume of the water displaced (Vd) and using the density of water (ρw) along with the gravitational field (g).

Illustration: Rhett Allain



Source link

Continue reading

Windows 11 build 26063 adds official support for Wi-Fi 7

The operating system now supports Wi-Fi 7, which brings wireless speeds of over 40 Gbps. Build 26063 also updates Copilot with more actions to...

Waymo’s application to expand California robotaxi operations paused by regulators

Waymo’s application to expand its robotaxi service in Los Angeles and San Mateo counties has been suspended for 120 days by the California...