#PhysicsQuestion: in "A Brief History of Time," Hawking describes how matter particles emit force particles, the recoil changing their directory and the impact changing their target's. This makes sense for repulsive forces, but how does that translate to attractive forces?

#ParticlePhysics #physics #gravity #magnetics #science #ScienceQuestion #ScienceQuestions

#Physics #PhysicsQuestion #NoDumbQuestions

Is there an upper limit to heat where matter doesn't hold atomic structure?

Is there a breakdown in atomic structures in a broadly 0K environment? Eg out in the Oort cloud, for example?

hello, I have a couple questions about #physics more precisely #relativity

How do I actually use #metric #tensors? Do I just do a dot product over the elements with a vector? If a metric tensor has a variable inside, does that variable comes from the vector and I just replace it? After I replace the vector and do the equation, only then I do the dot product?

If I want to have the inverse of a metric tensor, do I just do a #matrix inversion?

#physicsquestion #pleaseboost #pleaseboostme

Question: What is the derivative of the Lagrangian (of what system I don't particularly care right now) with respect to entropy (or to the time derivative of entropy)? Is this even a sensible question? Can we use the Euler-Lagrange equation for entropy?

#lagrangian #lagrangianMechanics #physics #physicsQuestion #entropy #eulerLagrangeEquation #eulerLagrangeEquations

Turns out infrared thermometers don't get the temperature of water right.
Alerted to this when dying a shirt.
IR thermometer said 85°C - while I wondered why the water was gently bubbling.
Digging out a mercury thermometer revealed why - it was at simmering at 100°C.

The shirt still seems to have dyed okay.

Any physicist care to explain?
#PhysicsMastodon
#PhysicsQuestion
#IRThermometer
#TheNeedForPurple

@gmusser Consider using a hashtag like #physics or #physicsquestion

Physics friends: When you fill a water bottle from a tap quickly, there’s an audible frequency sweep (to higher frequencies). Why? Can you write an equation for it? #physics #PhysicsQuestion