Recent content by Ez4u2cit

So why UV light? Is this strictly because it is short wavelength/high energy. In which case, would x-rays work?

Thanks. I was looking for the actual mechanism whereby the UV light induces the polymerization.

I recently purchased a bonding agent that is activated by an ultraviolet light (provided as part of the package). After three seconds of exposure to the UV light, the liquid substance turns rock hard. I believe they use the same process with modern dental fillings. Can anyone explain what is the...

Thanks. Seems odd though. Chances of it hooking onto a Bluetooth GPS seem kind of slim - I assume it would need to be within 30 feet and would require an initial ppairing with the device.

When I turn on the GPS on my phone, the phone (Apple SE) tells me to turn on Bluetooth for better accuracy.

Can someone explain why the GPS on my phone is improved when Bluetooth is on?

As Galileo said "the language in which the universe is written is mathematics" and yet, it is still a language, a symbolic abstraction. To paraphrase Wittgenstein, we run the risk of confusing symbols (words) with reality. In mathematics, if we cut an apple in half, then the half in half and so...

Just to simplify: I am on the spaceship. It is momentarily motionless in reference to the planet which is also motionless. As I fall towards the surface(experiencing gravity) , do I still need to fire rockets to stay on the straight line perceived by myself or someone on the planet?

If Mars or some other body is stationary, the spaceship is simply falling due to gravity, then the path of the falling body is not a straight line? Did I understand that right?

Thanks for the answers. I have a much better understanding of the concept as a model or map which helps explain and predict outcomes. I won't pretend I understand it beyond that any more than I can visualize four dimensional objects. I take my (small) hat off to those who can.

Thanks for the thoughtful replies. But I am having a problem moving forward from the theoretical to the perceived reality of my (ageing) ape brain. If I travel in an airplane between two points in three dimensions, taking the shortest possible route (straight line) experiencing gravity the...

So to put this in simple terms, what is curving if other dimensions are not involved? How is it possible to perceive a straight line as curved and remain in three dimensions?

Is not space curvature the curving or projecting into a higher dimension? Like a curved sheet of paper perceived by a two dimensional creature? The mystery seems to reside in our ape brains being unable to perceive (but not conceptualize) higher dimensions than three or relativistic, quantized time.