If you were to use a subsea lifting bag filled with O2 it would rise to the surface.

Would the same happen with CO2? I assume the density of CO2 is different so the amount required would be more or less than O2, but it is still less dense than...

Does CO2 float?]]>

Can gravity be negative?]]>

This question has been bothering me for some time, so here it is.

I know that moving a charged particle, like an electron, generates a magnetic field. I know that moving electric charges in a circle (a loop of wire) generates a magnetic field. The question is, will a charge

Does a moving charge posess a generated magnetic field?]]>

I am planning on building my first Focault Pendulum(As a physics projject for school) and I have a few questions. I am going to purchase a cable(it needs to be smooth and friction-less around 7 feet), I also am going to need to...

Foucault's Pendulum Recreation for Physics Project]]>

Changing distribution when going through a potential]]>

I am looking for a formula that describes the deflection of an inclined rope that is fixed in both ends, the left end is at the origin and the right end is at (xB, yB). The known parameters are; the length between the ends is L, the length of the rope is l, the initial angle is β and there...

Deflection of a inclined rope]]>

1). Quantum theory forbids point particles, because points themselves do not make sense in phase...

The Problem with Point Particles]]>

I am having hard time to know if the finite angular displacement really a scalar quantity?

In some books they say angular displacement when finite is Scalar and when infinitesimal small is Vector, with direction perpendicular to plane of circle government by right hand rule.

I...

Controversy about the nature of finite angular displacement]]>

First of all I want to mention what believe or result of concepts, do I hold about rotational motion especially about the angular velocity. I assume that unlike velocity angular velocity has to worked out from some point. I will begin with particle for this I assume that the question...

Does a rotating rigid body has single angular velocity.]]>

Tension (and Frequency) with Change in Temperature]]>

Question about statistical mechanics]]>

2) What will happen to the...

Spring in space?]]>

The Nobel Prize in Physics is upcoming soon and I wanted to hear your opinions and expectations about some important discoveries or inventions which might end up receiving this most major prize in science. I look forward to hearing your thoughts!

Thanks.]]>

Please help]]>

Confusion with multiple impulses]]>

What would the weight of a column of water be at the center of the Earth?]]>

T-symmetry and WDWE with regards to a Universe from Nothing]]>

The symbol for electrical current is I. But so is rotational inertia! Are there any other symbols for rotational inertia/electrical...

Other symbols for rotational inertia?]]>

What does negative potential energy mean?]]>

I read that the mass of nucleons in nucleus of Oxygen-16 (or nucleus of another atom) is less than the sum of its nucleons if they were separated (also the mass of 8 protons and 8 neutrons).

But why does nucleons have less energy in nucleus of atoms than if they were separated? What causes...

What causes mass defect in the nucleus?]]>

In going from Newtonian gravity to General Relativity, we can do away with Newtonian gravity and use only General Relativity...

In the atom, we can...

Superceded Theories]]>

Warp jet?]]>

What Materials Absorb IR The Best?]]>

Electric field (in)dependent of distance?]]>

Electric field of a ring:integrate over dq or ds?]]>

Homebrewing a spectrometer]]>

Some students replied: The floating object is interacting with the water. Therefore it exerts a downward force on the water. The water then exerts an upward force on the object due to Newton's Third Law....

Is Newton's 3rd law sufficient to explain buoyancy force?]]>

Is it simply shining lights on material to see diffraction patterns? Why the word "Transform"? I can't get any definition of this in the net. Is it about performing Fourier Transform on the light and getting this displayed on the screen or does the screen...

optical transforms]]>

But what is the L? And in what dimension?

Thanks heaps!]]>

Please have a look on the attachment. Suppose that a 0.1 kg rubber ball having velocity of 60 m/s is moving between two walls A and B, and the distance between the walls is 1 m. It is having elastic collisions with the walls.

Let's focus on what is happening at wall B. The ball is moving...

Pressure exerted by an ideal gas]]>

I've been watching too much anime. I know that isn't the best way to ask a question scientific in nature, but visualizing bizarre situations is one of the best ways to come up with interesting questions.

Anyways, in order to break a rock by compressing it with your hands, you would need...

An infinitly dense human body]]>

Assume desert 120F hot and very dry air can enter/exit at either bottom around ankles or at top around open...

Optimizing Evaporative Cooling via Sweat in Dry Desert?]]>

I am trying to solve a problem where I want to know how many cylinders of N2 (50L, 200 bar) are needed to flush a pipe filled with oil.

The pipe diameter is 0.5", so the volume of the pipe is 0.133 m3 (with a length of 1050m) which is filled with oil.

Behind the N2 cylinders is a...

Amount of nitrogen needed to flush a pipe]]>

My question is : in this link, it states interesting situation in electrodynamics is one where the current density View attachment 209565 is...

Maxwell’s equations with varying charge but constant current]]>

$$S(U) = \sum_{i=1}^{\infty}a_iU^i = a_1 U + a_2 U^2 + \ ...$$ with ##a_i \in \mathbb{R}##.

What results could be obtained from such...

Analysis of the entropy S of an arbritary system can be written as a power series?]]>

I heard once that this could be done using one of the towers of the World Trade Center. So I assume one could also do this using the Sears / Willis Tower in...

How much would time pass between watching the sun set ...?]]>

View attachment 210926

View attachment 210927

The probability that the system has the energy ε i.e.P(ε).

The system could have any energy between 0 and E.

So, P(ε) = 1/(no. of possible systems with different...

Canonical ensemble]]>

The wheel balances as a Segway by applying power to the wheel. (the classis reverse pendula).

However, since its a unicycle, it does not balance sideways, and I imagine that this colud be solved with a...

Making an electric unicycle really selfbalanced]]>

often considered to be "point particles", and I know there are

fundamental limits on measurements due to uncertainty in

position and momentum. I also know that according...

How could the "size" of a photon be measured?]]>

What's the physics description of "existence" ?]]>

Meaning of permeability in free space]]>

Thanks in advance.]]>

This is one of the factors to calc NPSH. Shows how much head is pushing liquid through the pump.

What does the specific gravity have to do with surface pressure of a liquid before it goes into the pump? Isn't it just involving the...

NPSH Suction Surface Pressure]]>

Joule Thompson effect]]>

Acceleration and gravity]]>

Magnetic field of a single charged particle]]>

I'm projecting a circular beam of some known divergence and power onto a surface angled relative to the center of the beam. Say holding a flashlight, with a cone of half angle

Irradiance distribution of projected beam]]>

I wonder why the energy that waves transfer is only dependent on amplitude?

E.g. in this animation:

http://lifecdn.dailyburn.com/life/wp-content/uploads/2015/02/2.Alternating-Slam4.gif

The waves on the rope transfer energy to the items on the right side.

Wouldn't there be...

Why the energy that waves transfer is only dependent on amplitude]]>

View attachment 210704

View attachment 210705

I just have a general question about Guass's Law and the cylinders above. I don't really understand what the difference is between the 2 cylinders? They are both...

Conducting Cylinder vs Cylinder of Charge - Guass's Law]]>

Wave-matter interaction]]>

What properties allow me to see past Earth's curvature?]]>

Im using coconut oil because information from this site suggests that it is very transparent to uv light....

Radiation Induced Reduction of Fe3O4]]>

I am really confused to draw a clear line between what is science and what is not .

I know science has some characteristics which differentiates it from...

What is scientific and what is not?]]>

I would really appreciate the help.

Thanks!]]>

I've made a lot of research about measurement of high magnetic fields - such us 1T - 2T and I can't find sensors for this range.

I'm looking for a hall sensor with which I will be able to measure 1T magnetic field with good accuracy - about 0.1 mT. Do you know about anything like that?...

How can i measure high magnetic fields?]]>

Jim weighs 160 lbs.

The rope isn't holding him up, it's there for him to...

Force Needed to Push Manual Treadmill]]>

Why is a newton of force .225 pounds?]]>

Pressure variation during resonance?]]>

The Kirchoff integral for monochromatic wave is:

$$U({\mathbf {r}})={\frac {1}{4\pi }}\int _{S'}\left[U{\frac {\partial }{\partial {\hat {{\mathbf {n}}}}}}\left({\frac...

Huygens principle from Kirchoff Integral (sign doubt)]]>

Then how could living beings evolve when they are an extremely ordered system?]]>

I was wondering about the relation between the Gradient, Electric Potential, and Electric Field. I know that if you take the Gradient of a scalar field, you get a resultant vector field in which the vector points in the direction of greatest increase when you take a infinitesimally...

Gradient, Electric Potential, and Electric Field]]>

Directional electron cloud/separating ions from free electrons]]>

Why does water level stay the same when ice melts inside the water?]]>

View attachment 210476

After reading the original paper about Taylor dispersion, I know...

Questions about Taylor dispersion in laminar pipeflow]]>

I photographed our television with the flash on in order to recreate a strange patter i saw when looking at the suns reflection in the screen.(with my eyes it's not just the camera)

You can...

Strange Optical Phenomenon (diffraction or something else?) (solved)]]>

View attachment 210563

hi, I wonder that inclined plate capacitor formula is the formula in last picture I shared???? I am not sure because there are not enough examples about that ???????????????]]>

If higher temperature is correlated with shorter emitting wavelengths, how come there are incandescent light bulbs that emit yellowish light but are hotter than incandescent...

Emission spectra of different materials]]>

QM Science Fair Ideas]]>

How do you find the heat radiation between two surfaces that aren’t perfectly parallel or perpendicular to each other?

I know that the view factors play a part, however, I can only dig up view factors for parallel and perpendicular surfaces:...

Heat radiation between two non-parallel surfaces]]>

Question about finding resonant box dimensions]]>

What about a mirror? Surely...

Polarization of light and diffuse/specular reflection]]>

Is this correct?

Thanks]]>

I have some springs which are about 18” long and stretch to 30”, so they stretch 12”. If 8 springs are available and...

Determining energy from spring arrangements (parallel&series)]]>

I know the key is evenly distributed flow, so maybe two small motors. Maybe add a grate?

this vid gave me this idea:

View attachment 210368

thanks in advanced if anyone reads this thread]]>

Above is the equation I am using. The emissivity for the material is 0.05, the area is 1 m^2, the...

Thermal radiation inside a cooler]]>

I would like to calculate the difference between a white surface wall surface and the same kind of wall but with brown outer surface. I would like to know the reflection and absorption indices and then calculate the surface temperature of the wall in the two solutions at the same...

Reflection and absorption]]>

Comparison of tidal forces acting on the Moon vs Enceladus]]>

Effects of wind on a moving person]]>