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HNQ
1:02 AM
6
Q: How strong is the force of ice expanding when freezing?

Vilx-This question reminded me about something I've been wondering myself for some time. We know that water expands as it freezes. The force is quite formidable - it can cause solid steel pipes to rupture. But nothing is limitless. If we created a huge ball of steel and placed a small amount of water ...

3
Q: What is the counter-force to suction force?

RobbeI've been thinking about air pressure and vacuums recently and a (for me at least) interesting question came to mind: If there is an area with lower pressure than the surrounding air, the air distributes itself equally until the pressure is even everywhere. For simplicity's sake let's say it's no...

 
 
3 hours later…
HNQ
4:23 AM
2
Q: Why was more dark energy created during the creation of the Universe than normal energy?

user57467I would like to know if there is an agreed upon explanation within the field of Physics as to why more dark energy than normal energy was created during the creation of the Universe. More is unknown than is known. We know how much dark energy there is because we know how it affects the universe's...

 
 
16 hours later…
HNQ
8:20 PM
3
Q: Solution to pendulum differential equation

John DoeIn a chapter on oscillations in a physics book, the differential equation $$\ddot{\theta}=-\frac{g}{L}\sin(\theta)$$ is found and solved using the small-angle-approximation $$\sin(\theta)\approx\theta$$ for small values of $\theta$, which yields the solution $$\theta=\sin\left(t\sqrt{\frac{g}{L}}...

 
 
2 hours later…
HNQ
10:01 PM
3
Q: Could Planck's constant be changing?

therrHas the true value of Planck's constant always been a constant? As we progress we can get a more accurate measurement of the constant, but I would like to know if anyone has ever thought about the actual value of Planck's constant in the sense that it could change or evolve?

 

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