The current moving is clockwise, So the magnetic poles would be as shown.

Now my problem always is this, I get so confused with this, I used Fleming's left hand rule to find the...

Direction of the force on a conductor in a solenoid]]>

Reason for black gel pen refills leaking in winter]]>

the definition of potential difference: is how much each coulomb of the charge loses (transfer ) energy when going from a to b

an example to clarify the question...

How can each Coulomb of charge transfer energy]]>

Thanks!]]>

https://www.quantamagazine.org/what-makes-the-hardest-equations-in-physics-so-difficult-20180116/]]>

https://phys.org/news/2018-01-efficiency.html

My questions are:

1. If "converting" information into energy requires a system (the demon I suppose) having a photodiode, processor, laser (light trap) all expending energy in order to cause the...

Nearly Perfect Efficiency - 2nd Law of Thermodynamics]]>

Thermal efficiency of a Diesel engine]]>

Asymmetrically charged capacitor]]>

Second experiment:...

Why does egg float upwards in stirred bottle of water?]]>

...

In this 19 sec. video, a guy climbs up a building by jumping against two opposing walls. I don't see how that could be possible. Some shoe-soles materials stick very well on smooth-shiny surfaces, true!, and the guy's mass has a side-to-side motion and less...

Is it physically possible to climb up a building like this?]]>

All things being equal, if two objects have the same kinetic energy, does the fact that one is larger and heavier than the other (although at a slower velocity) mean anything?

Specifically when comparing bullets. One bullet .451" in diameter,...

Kinetic energy, size of object, and force applied]]>

- How do trees for from trees? Don't they just create more matter
- How can something change shape...

Is It true that matter can not be created or destroyed?]]>

So if a rock fell 20,000 meters to Earth assuming no air resistance and no other gravitational forces from anything but Earth, how long would it take the rock to hit Earth? Keep in mind acceleration is changing through the gravity equation as the rock gets...

If a rock fell 20,000 meters to Earth Question]]>

Thanks.

--

lightarrow]]>

Splitting force vectors into components]]>

I'm currently doing the project and need to estimate the force that will act on the micron size superparamagnetic particle in the field of permanent magnet.

I found several article there similar problem is solved, but I a bit confused. I hope someone could hep me.

So, the main equation...

Force acting on superparamagnetic particle]]>

Understanding of gravity in the Middle Ages]]>

I have a few questions about this.

If this is correct why are we taught to use...

Newton’s Laws and Euler’s laws]]>

I would like to ask you what happens when you change (gradually) a mass of one body in a classical two-body-problem.

May it lead to such results?

View attachment 218611

Many thanks.

Flor]]>

The total force acting down is 30N, so therefore the...

Forces: hand holding a tray]]>

Does this make sense? That's my best...

What is the relation of mass and power?]]>

Non symmetric case of Ampere's law]]>

initially my attachment/picture has been cut off that link http://sun.stanford.edu/~sasha/PHYS780/PLASMA_PHYSICS/phys780_2014_l13.pdf page 6

Also I would like to put into words that divergence of current density is accepted as 0 in continuous loop( no...

Generalized Ohm's law]]>

https://www.wired.com/story/the-physics-of-the-69-degree-intersection-that-kills-cyclists/]]>

Can antimatter-matter be used as a fuel for a rocket?

There are various problems for anti-matter to be used as a fuel as it produces a lot of gamma...

Energy density of annihilation]]>

How to calculate the distance that a bungee will extend...]]>

Exponential decay convolved with Gaussian]]>

Can a bicycle be tipped over by only applying rear brake?]]>

So Rx1 = Rx2, Ry1= Ry2, Ma1 = Ma2

Now my book says we can use another form of equation: We can choose 3 point and find the moment...

Force-couple system equivalence: 3 moment equations]]>

I am trying to design a cooling system that will use chilled water around 1deg C to cool vegetables that have been cooked.

So...

Cooling of vegetables with water]]>

Say I have a ball on the end of a string that I hold with my hand and rotate at a constant speed. If the string provides the centripetal force and acceleration, where...

Uniform circular motion - origin of speed]]>

Divergence of ##\frac {1} {r^2} \hat r##]]>

Physics Laws and Dimensions]]>

A quick discussion about blackbody theory. As a premise, this is what I know:

A blackbody is an ideal body that absorbs all types of radiation incident on it, no matter its wavelength. Once absorbed, the energy is used to increase the blackbody's temperature and when the...

Black Body and the colored objects around us]]>

The RHS involves only the enclosed current inside the...

A Doubt about Ampere's law]]>

here few lines about...

Stray field and demagnetizing field]]>

and introducing (and displacing) into this container a parcel of 30F air of volume Y (which is less than the volume of X)...

Is there any way to...

Time to warm a volume of air to room temperature in a container]]>

Current applied to mu-metal]]>

The lens in question would be a 1/4" slice from something like a 26x13mm lens. The dimensions would then become 6.35x13mm,...

Estimating the FOV of a thin sliced plano-convex cylindrical lens]]>

Will we be able to visit other solar systems anytime soon?]]>

Why were Newton's laws of motion discovered so late?]]>

ΣF=Σk(qi)(qj)/(r^2)

Question:

Considering more than a couple of particles. How can a net force on a charged particle be calculated if Coulomb's law is under the restriction of static forces?

Thanks!]]>

Satellites and the Earth's Magnetic Field]]>

A Question about potential difference in Wire]]>

Matter density on the bottom of a liquid container vs hanging in the middle of it]]>

Can you tell me about that?

Thanks.]]>

Anamolous Aerodynamic behaviour of small spheres?]]>

How to write measured value with error]]>

Let's use the photoelectric effect as an example. A photon with energy E = hν strikes a conductor, ejecting a photoelectron with a maximum kinetic energy of hν - φ. Assuming the...

Conservation of electrical energy on a conductor]]>

An interesting incident occurred. I heated water to near about boiling temperature, and filled the...

Weird sound coming from thermos flask]]>

I am trying to understand what time^2 and velocity^2 mean in terms of how to...

How does calculus relate to dimensions?]]>

[ In the context that parabolic mirrors have been created by rotating a liquid ] The volume left above

the parabola is also parabolic, so ...if that volume is used as a mold for casting it should form a reasonable solid lens, at least for...

Fresnel lens concentrator DIY]]>

Name the forces involved?]]>

Would it be possible to make something float?]]>

Now consider an infinite line of charges (with a small separation, the same between each charge). If the whole line is moving...

Does the superposition of electric fields not hold for moving charges?]]>

Trying to understand diffraction]]>

When i attempted to apply the formula it crossed my mind that the unit of T is (N•m), if so how do we solve for distence 0< r < 1.

#2 Another question if the unit is {(kg•m)/(s^2)}•m why did he represent moment with Newtons?...

Work and momentum]]>

What in gravity makes water on Earth into a ball?]]>

d^2x/dt^2 =...

Having a hard time remembering what this equation is]]>

How do I check if the equation of motion of the particle, with a given potential, is invariant under time reversal?

For a 2D pointlike particle with potential that is e.g $$V(x) = ae^(-x^2) + b (x^2 + y^2) +cy', where a,b,c >0$$

Can it be done by arguing rather then computing?

Thanks!]]>

What type of energy does electrical current have?]]>

Lets say a Hydraulic Jack is placed in a square steel frame so once the jack is operated it acts upon the top and bottom rails which are held in place by the two side rails....

The jack is pumped up to say 10 tonnes - does...

Forces between two immovable objects]]>

1) doesn't block light but scatters it

2) it makes no use of polarizers...

PDLC film or glass for optical shutters or shutter glasses]]>

Helmholtz free energy concept]]>

So far i understand almost everything until i get to the part where...

Equivalent mass of rotating parts]]>

dN/dt = -λN

Has anyone tried finding the rate of the rate, or the rate of the rate of the rate, etc, to make sure that the rate of the rate of decay (etc.) isn't changing??]]>

Photoabsorption cross sections]]>

Knowing if the elevator is moving or not]]>

What is the final velocity of a ball rolling through a tube?]]>

I am determined to figure this out more or less on my own but I need some assistance with the...

Working on a simple(ish) projectile motion problem for a gaming program]]>

I cannot for the life of me see any flaws in the argument,...

Attempt to find the magnetic field of a moving charge]]>

Magnetic field of a moving charge and coulombs force]]>

Question about Inductors]]>

However I still see some author states that the Mach cone is the shock wave. Shouldn't the shock wave be at the intersection(between the circles)...

Confusion about Mach cone]]>

In electrostatics, we have Coulomb's law for the electric field of a point charge. We can generalize to the electric field of a continuous charge distribution, using $$E=k\int r^{-2}dq.$$ It would seem, using the same argument that gets us to the previous equation, we could define the...

Why center of mass? Why not center of charge?]]>

Physics behind Weebles]]>

I find this topic particularly fascinating. Can anyone point me to a good article/or provide a summary which explains how the 4 fundamental forces work? If possible not wikipedia, I find wikipedia very jargon-y.

I did a search and found some rubbish I posted a couple of years back...

Trying to get a basic understanding of the 4 key forces?]]>

Am I making too many threads?? :O]]>

Is there a fundamental relationship betwen the probability of ocurrence of an event and the flow of time around that event?

I mean, imagine an isolated space where some type of...

Probability and time]]>

However, much of a drum's sound (especially snare) comes from the "ring" of the...

Calculating Vibration Modes of a Cylinder (Drum Shell)?]]>

Before this I never used to question really alot of things i took for granted, but now I see the world with a different light although I'm still quite the novice.

Something that used to make me...

Motion of a Door as I Walk by it Quickly (no contact)]]>

It...

Rates of Change and Multiple Dimensions]]>

I expect that the (-100) term will cause the angular velocity to decrease to 0 but since displacement is increasing during this process,...

Unclear on interpretation of equation - oscillation maybe?]]>