Classical physics is a group of physics theories that predate modern, more complete, or more widely applicable theories. If a currently accepted theory is considered to be modern, and its introduction represented a major paradigm shift, then the previous theories, or new theories based on the older paradigm, will often be referred to as belonging to the realm of "classical physics".
As such, the definition of a classical theory depends on context. Classical physical concepts are often used when modern theories are unnecessarily complex for a particular situation. Most usually classical physics refers to pre-1900 physics, while modern physics refers to post-1900 physics which incorporates elements of quantum mechanics and relativity.
Hi everyone,
I was looking to develop my physical insight when I encountered this book by Lewis Caroll Epstein. For the crosswind problem, I couldn't understand the author's explanation; in particular, his concept of "artificial wind," and the force being larger in this case than the previous...
Is there any use for this concept in classical branches of physics? Can it be of any help for a physicist in resolving problems (or, at least, in resolving them more efficiently when compared with traditional methods)?
The word «classical» means exactly that, i. e. mechanics, hydrodynamics...
Homework Statement:: Sand is rough and black so it is a good absorber and radiator of heat depending on temperature.
During the day, sand's radiation of the sun's energy superheats the air and causes temperatures to soar. But, at night most of the heat in the sand quickly radiates into the air...
The question I have is that if the aero plane is traveling in the same direction as the wind, would it not increase its velocity, as in with boats and streams? So, if by chance, ##w = v##, then the velocity of the aero plane would double. It feels weird as going by the same logic, if the speed...
Looking for some guidance on how to set up the equations for a projectile intercept given that you have perfect information about the target velocity, size and weather conditions in a 3D scenario, it's for an amateur videogame that I'm developing in my spare time
For simplicity sake let's...
dP = F dt
dE = F dr
or if we introduce ds = (dt, dr)
(dP, dE) = F ds
And both dP and dE are constant in closed system.
Some questions:
- How does its implies on definition of Force?
- Is there some clever geometrical interpretation of Force?
- Why P and E seems almost interchengable?
In my book, the potential gradient for a charge placed anywhere in space is defined as: E = -V/r
HOWEVER, for parallel plate (capacitors) the potential gradient is defined as E = V/d (V being the potential difference). How come there's no negative sign for the potential gradient of the parallel...
Hi everyone. I'm a new member, great to be here:)
I have a few questions that I wanted to ask you guys regarding the method by which we implement the Runge-Kutta approximation of Projectile Motion if we should do it using a numerical iterative method with a Spreadsheet like Excel.
I have...
In Rigid body rotation, we need only 3 parameters to make a body rotate in any orientation. So to define a rotation matrix in 3d space we only need 3 parameters and we must have 6 constraint equation (6+3=9 no of elements in rotation matrix)
My doubt is if orthogonality conditions...
I tried to solve this problem and this is what I could come through:
When the object is moving, the force acting on object is the frictional force, so, it got to be μmg.
So, F = ma and as F is μmg
μmg = ma
μg = a
So, to find out the magnitude of the initial velocity v given to the smaller...
Morning all
I've recently come across a problem where I get conceptually but cannot apply mathematically if that makes sense.
I understand the position of the third mass must be at the equilibrium point of ##m_1## (##9.0×10^{24}kg##), so ##\Sigma F = 0## right? And not even necessarily zero...
As a Computer Programmer, it's hard to wrap my head around Quantum Entanglement and non locality being explained in the context of Classical Physics. In other words, if the universe at it's core is physical where does Quantum Entanglement fit within a physical picture of reality?
There's been...
I'm reading Mechanics by Landau and Lifshitz, chapter IV, and trying to understand how in a (closed) center of mass system, with randomly distributed and oriented particles that disintegrate, "the fraction of particles entering a solid angle element ##do_{0}## is proportional to ##do_{0}##, i.e...
I am starting to learn classical physics for my own. One exercise was, to calculate the vector r (see picture: 1.47 b). The vector r is r=z*z+p*p.
I don’t understand this solution. My problem is: in a vector space with n dimensions there are n basis vectors. In the case of cylindrical...
Homework Statement
Homework Equations
F= ma or F= md^2x/dt^2
The Attempt at a Solution
I know that this second order differential is non linear. I attempted to solve the problem as -k/x^2 = md^2x/dt^2 but I'm getting trouble since it is a second order ODE and I haven't learned how to solve...
I would really appreciate if someone could advise me whether the system below is a scleronomic or a rheonomic mechanical system, or a mix of both. If we consider the first pendulum, the constraint is fixed which leads to a scleronomous case while the constraint of the second pendulum is not...
Hi! As the title suggests, I am searching for some good problem books with really challenging problems for classical physics, more precisely on the topics of electricity and elecromagnetism, geometrical optics and wave optics, thermodynamics and analytical mechanics. When I say challenging I...
How can I find the relation between the radiance and the energy density of a black body? According to Planck's law, the energy density inside a blackbody cavity for modes with frequency ##\nu \in [\nu, \nu + \mathrm{d}\nu]## is given by $$ \rho(\nu, T)\mathrm{d}\nu =...
Where in this though-experiment do I get it wrong?
Even though no mass can travel faster then c, maybe information can? And I'm not talking about quantum entanglement etc.
Consider a pipe, filled with balls that are very tightly arranged. If I push the outermost ball on one side of the pipe...
Homework Statement
Refer the given image. [Prob 2.9]
Homework Equations
F=ma
The Attempt at a Solution
I drew the normal vector perpendicular to the surface of the cone and resolved it as
##Nsin\theta=mg##
##Ncos\theta=\frac {mv_{0}^2} {r}## where ##v_{0}## and ##r## are the speed and radius...
For example F=ma means that the definition of force is m*a or the quantity of left side equals to the quantity of right side or both ? or kinetic energy..we know K=1/2mu^2 but is this the definition of kinetic energy or just the formula to calculate it ?
A particle of mass m in xy plane is attracted toward the origin with the force
$$\begin{align}\vec{f} = - \frac{k^{2} m}{r^{6}}\vec{r}\end{align}$$ where ##\vec r## is position vector of particle measured from origin. If it starts at position ##(a,0)## with speed $$v=\frac{k}{\sqrt{2} a^{2}}$$...
Ive always been fascinated by the subject, and i absolutely love learning new concepts, especially when theyre intriguing and brain-twisting, but i can never seem to grasp onto the depths of concepts for a long time. Suppose, if i stop working out problems for a week or so on a particular...
Hi,
I know that in an elecric field the potential energy ##E_{pot}## is equal to the potential ##V## times the charge ##E_{pot}=q V##.
Here my problem:
I know that the potential energy of a spring is ##E_{pot}= \frac{1}{2}kx^2##.
In my theoretical physics book i read also that the potential is...
If you have a rectangular box connected on 3 sides with strings, and you hold all the strings together at a point, with your hand; then you put a weight in the center of the box, which is open, would the tension on the strings differ than if you put the weight at a corner. Please describe it to...
Homework Statement
Dimensional formula for 'the square of the distance between two bodies' in universal gravitation and 'distance from the axis squared' in moment of inertia. Is L^2 is the dimensional formula for both the distances in the above two cases?
Homework Equations
F=Gm1m2/d^2; moment...
I plan on building a swing set for my daughter, and I always loved the feel of a good tall swing. I like the long range of motion, the nice glide ... but is there such thing as too tall?
I was planning on going about 14' off the ground with the cross beam .. then I figured, well, let's go with...
Hello guys, I programmed a physics simulation where a particle with some initial conditions bounces off the walls of a 2d container. The simulation also includes gravity in the y-coordinates. The aim of the project is to produce a visual animation and further on include more particles and...
Hi, I was wondering, as in the Bachelor's degree curriculum there is no SR course, for one who is interested in theoretical physics (as me), would do it alone, perhaps with texts such as Rindler or Synge ...?
Thank you in advance !
Hi there,
I've been trying to solve the following problem, which I found looks pretty basic, but actually got me really confused about the definition of angular momentum.
Problem
The trajectory of a point mass m is described by the following equations, in spherical coordinates:
r(t) = r_0 +...
In Chapter 11, section 11-4, subsection friction and rolling, it is stated that the static frictional force is along the same direction as the direction of motion because the point of contact of the wheel with the floor is moving in the opposite direction. Then, in the next subsection, the same...
So I just got beat up by this question on my midterm. I'm not sure if these problems are always called definition of success but that is how my professor refers to them as.
The question: (paraphrased)
When you walk into your dorm room you like to throw your keys onto the center of your desk...
this is a small part of a problem on tidal forces and I wasn't sure what the question asks as it seems to me that more information is needed. Am I right or is there something I am missing? the question goes as:
"A spacecraft approaches a neutron star of radius 10 km and mass 1.5 times mass...
Hi everyone, first post here.
Today i crushed into a question. I was going to write it down here, then i crushed into another one.
Lets say we want to know the potential energy of a body relative to a center of gravity.
I will refer to gravitys acceleration as "g" and to mass as "m". "k" will...
I am not sure if this is the right place to ask it, but this is a question that I thought today, and it gave me some curiosity to understand. Imagine that a car will curve, we can say the turn is a bit tight , what are the factors that can help it to flip? I was wondering about some aspects...
Hello everyone. A Philosophy of Science friend showed a site where you can upload your paper and then you will be fairly quickly reviewed by your peers and this will be published alongside your paper. It seems to me this is a very good way to proceed; you may get assessment from the very top...
Hi There.
I want to ask a question, here it is :-
How to find the path of a particle if initial velocity(vector) is given and constant force(vector) acts on the particle.
Like :-
1) How can we determine the path will be PARABOLIC
2) How can we determine the path will be CIRCULAR.
3) How can we...
I want to drop a rocket-shaped object from a near-space balloon, with the aim of maintaining a downward acceleration that leaves it's contents in microgravity.
I think that this means:
The (unpowered) rocket needs to maintain as close to 9.8m/s2 acceleration in order to balance out the...
Many of you might have seen veritasium's video on the "Anti-gravity wheel". Through one of the comments, I was introduced to the idea that the reason the apparatus is so easy to lift is because the energy to do so comes from the spin of the wheel, i.e. its rotation slows down as it is lifted and...
Homework Statement
We are trying to find out whether we can hit a weight ##m=3## kg up to a given ##h=15.24## meters with a hammer with a head of ##m=6## kg swung at ##v=10## m/s.
Homework Equations
KE=0.5mv^2
PE=mgh
p=mv
The Attempt at a Solution
One solution is to even see if the energy...