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18 votes

Rotating a Pot of Boiling Water on a Stove

When you rotate the pot, you are jiggling the pot and stirring up the boundary layer between the pot surface and the bulk water. Shaking & stirring the water increases the chances of temporarily ...
niels nielsen's user avatar
7 votes

Rotating a Pot of Boiling Water on a Stove

Bubbles generally need a focus point to determine where they form to nucleate the formation of the bubble. If you happen to have a pot that has an imperfection such as a scratch on the bottom, you ...
KDP's user avatar
  • 5,201
6 votes

Rotating a Pot of Boiling Water on a Stove

What is the type of stove you have? Gas flame? Electric burner? Other? Your description fits excellently with an exposed electric burner stove. The pan does not sit perfectly on the burner. ...
BowlOfRed's user avatar
  • 40.6k
3 votes

Does a rubber mat reduce the impact to the floor below?

If dropped, the falling barbell will carry a considerable amount of kinetic energy when it hits the floor. Preventing damage to the floor involves managing that impact energy. Here is how to do it: A ...
niels nielsen's user avatar
2 votes

Absorption respose of cones in eye

It would take a long time to sift through all those references and come to a conclusive understanding of their strengths, weaknesses, and differences, but I think I can offer a likely and simpler ...
underdeterminate's user avatar
1 vote
Accepted

Why do gaps in my blinds create multiple lines?

The slits are acting like a pinhole camera (although only in one dimension). The nice shadows are likely images of something in front of the blinds. Since the shadows are very regular, I'd suspect ...
BowlOfRed's user avatar
  • 40.6k
1 vote

Why do gaps in my blinds create multiple lines?

These are really cool photos and they really do demonstrate the fascinating properties of light. However, the projections you're seeing are not just the direct result of light passing through slits. ...
Tristan's user avatar
  • 154
1 vote
Accepted

Why clothes keep us warm?

Your thought experiment is to have only thermal conductivity to draw heat away from someone. In one case, the thermal layer is air. In another, it is a layer of clothing. This is a problem with a ...
Jeffrey J Weimer's user avatar
1 vote

Why clothes keep us warm?

Air next to your skin gets warm and then carries heat with it as it moves away. Reducing this is key. Down does it by trapping air between feathers. One cotton shirt is very little help on a cold day. ...
mmesser314's user avatar
1 vote

Is it possible to see thermal columns?

The refractive index of air is often taken to be one, but in fact it's slightly higher. Under normal conditions it's about $1.0003$. To a good approximation the refractive index minus one is ...
John Rennie's user avatar
1 vote
Accepted

Why do large trucks have a longer stopping distance than cars?

The stopping distance difference between large trucks and cars is what you'd expect based on the sources cited in the question. If a typical passenger car initially travelling at $55$ mph stops in $...
David Bailey's user avatar
  • 11.5k
1 vote

Can a pot become hotter when the stove is on?

You're thinking about it wrong. For this scenario, think of heat as a process, not a state. You are not "setting" the temperature to 400; you are setting the rate at which heat goes into the ...
fectin's user avatar
  • 111

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