bodies Definition and 501 Threads

When only force acting on body is a central force, angular momentum is constant and given by: L = mr^2 * w where r is distance from origin, and w is angular velocity. Angular momentum can also be written as following: L = r x mv = rmv * sin(theta) where v is tangential velocity, which is...

Many asteroids and planets have undergone enough heating so that they were at some point completely or partially melted. What physical mechanisms are in play here? I'm assuming a solar system such as our own. Thanks!

Here is the question (Qu 9): Here is what I have attempted: assumed that the accelerations are equal, found a value for the acceleration, thus worked out the time taken for A to reach the bottom. then assumed that the tension becomes 0 once A hits the floor, and then worked out B's new...

Good Morning May I ask about spatial collisions of bodies? In undergraduate dynamics, we study that when two particles college, we have two final unknowns: the final velocity of each particle. We first use the conservation of linear momentum. However, we supplement the analysis with the...

At a certain point during embryonic development (late blastula), one of the X chromosomes in the female condenses and become a Barr body. It's random if this X chromosome will be paternal or maternal, creating some cells with paternal X chromosome and some cells with maternal X chromosome. We...

The Setup is the cart-pulley-hanging mass or Atwood machine: if the cart is allowed to fall over the edge, and falls freely with the mass, will the rope tension remain the same as it was before the cart went over the edge? Is this situation the same as if the cart-rope-mass were held aloft by...

I have been searching for an answer to this for a really long time and I have not found any definitive answers as of yet. What I am trying to do is determine if and when two bodies collided between the times t0 and t1. Calculating this is much more straight forward if each body is only either...

Homework Statement My problem has two parts. 1) We have two point masses ##m,M##. and there is another mass ##m_1## between them.They are all aligned in a line. Mass ##M## is moving with speed ##u_1## toward ##m_1## and after collision and all other masses are not moving. we want to find...

Hello, I'm reading a textbook named "Introduction to Rocket Science and Engineering" by Travis S. Taylor. I'm now in a general cosepts about orbits. I have a question, what the book says in here? I can't understand the bold formatted sentence. What the author try to mean? If you can, can you...

Homework Statement Homework Equations ##v=\omega r## The Attempt at a Solution So, using the equation, one can work out the velocity at point ##B##. ##v_B=\omega_{AB} \cdot r_B## ##v_B=6(0.4)=2.4~ ms^{-1}##I then tried working out the angular velocity at point ##C## using the instantaneous...

When I derive the equations of motion for 2 or more bodies where one is rotating and the other is a mixture of rotation and translation, I get a term multiplying angular velocity squared. I know its right but I don't know what to call it. Can some help me with what to call it (it means C1*ω2...

I'm a physicist but my field is at the other side of the spectrum, but my curiosity has no bounds :P Based on observations we know of several configurations 'clumps of matter' can take, like planets, gas giants, comets, or basic rocks etc. But I always wondered about more unusual possibilities...

I was thinking that it would be cool to be able to create an artificial intelligence for video games which has an understanding of celestial bodies in relation to clumps of enemy units. The enemy units become the celestial bodies, and your units clump to engage them. I would be running the...

Hey guys, new member here! I am an undergrad engineering student and I am currently working on a project for a course that requires designing a ballast system for a manned submersible and I was wondering... Are there regulatory bodies in Canada that you know of that is responsible for...

Hey guys, new member here! I am an undergrad engineering student and I am currently working on a project for a course that requires designing a ballast system for a manned submersible and I was wondering... Are there regulatory bodies in Canada that you know of that is responsible for...

Assuming no conduction and no convection will a colder body be able to send photons to a hotter body while the hotter body is sending photons to t. We all know that an equilibrium will result with a temperature somewhere between the two bodies but do the photons emitted by the cooler body...

Homework Statement [/B] A thin cylindrical rod with the length of L = 24.0 cm and the mass m = 1.20 kg has a cylindrical disc attached to the other end as shown by the figure. The cylindrical disc has the radius R = 8.00 cm and the mass M 2.00 kg. The arrangement is originally straight up...

Homework Statement Two uniform 150 N rafters rest on frictionless floor, held together by a rope. A 500 N load is held at their apex. Find tension in the tie rope. Homework Equations ##torque= rFsin \theta =Force*Moment Arm ## The Attempt at a Solution The angle ##\theta## in the picture...

Every celestial body revolves around a relatively massive celestial body due to the gravitational influence. But what is the reason behind their rotation about their own axis? What thing initially triggered their rotation? Does it have something related to the origin of the universe?

I set a small project for myself to design a controller for a rocket, which moves a mass around to shift the center of mass, in order to steer a rocket. The picture shows a simplified model of a rocket plus a movable mass. , shown is a rod for the rocket, and a mass for the controller. there...

Hi, I am an Alevel science student and looking forward to study Astrophysics in university. Can someone recommend books that are more like fact books with descriptions of celestial bodies, their composition, formations and etc. Like more like an encyclopedia than a book .

Homework Statement If a falling object overcome 72 metres in 6 second, how much distance it overcame in first 3 second. Homework Equations s = ut+(at^2)/2 The Attempt at a Solution Here, s = 72 m u = 0 t = 6s a = ? We know, s = ut+(at^2)/2 Or, 72 = 0*6 + (a*6^2)/2 Or, 72 = 36a/2 Or, 72 = 18a...

Hi Forum, I've been pondering about this for a while and I hope someone here can help! Imagine two bodies orbiting each other in tidal locking (https://en.wikipedia.org/wiki/Tidal_locking) just like Pluto and Charon, or as Earth and a geostationary satellite. Nothing else exists in this...

Homework Statement If a 6.5m diameter telescope operates at wavelengths between 600nm to 2800nm, and for stellar densities similar to the Solar neighbourhood, what is the range of distances this telescope can resolve individual stars? Homework EquationsThe Attempt at a Solution My attempts so...

Legit question. When we get a cut or scrap, blood comes out. In a few moments the blood dries and forms what looks like a layer of dried blood that gets a darker color. If that happens, why doesn't blood dry inside our bodies?

Energy is required to make a body fall towards its surface i.e. to produce acceleration. That means energy will be lost by the body causing it. Energy is equivalent of mass. Therefore a loss in energy would mean a loss in mass. Right? I most sincerely apologise of I am wasting your time by...

Homework Statement two linked are attached to each other with a spring. If the second body is placed on a fixed support, the length of the spring is 5 cm. If we fix the first body as in the picture, the length of the spring becomes 15cm. Determine the length of the spring in the non-deformed...

Homework Statement Hello! I have 2 bodies initially at rest, of equal masses with the distance between them a and coordinates ##(a cos(\theta),a sin(\theta))## and ##(-a cos(\theta),-a sin(\theta))##. If we denote ##a_x## and ##a_y## the horizontal and vertical distance between them they...

Imagine a moving rigid body B1 like a golf clubhead impacts with a stationary elastic body B2 like a golfball. Imagine that the initial velocity of the golfball at time T1 is zero, and the final velocity of the golf ball at time T2 is some value. Imagine that time T1 is when the clubhead first...

Pulsars are known to rotate at very predictable frequencies. If a beep or short tone is assigned to each rotation, the spin of the star can be 'sonified'. Pulsars spin anywhere from a few fractions of times per second to over 600 per second. 600 cycles is audible in the human range of hearing...

Homework Statement There are two objects m and 2m and Force F is applied on both objects. They move a certain distance X. Which one have greater momentum and find out 2m has √2 times more momentum than m. Homework Equations momentum P=mv The Attempt at a Solution 2m has greater momentum...

I'm in a graduate course in Physics to obtain a master's degree. I have a major in mathematical physics and my main interests are General Relativity (GR), Quantum Field Theory on Curved Spacetimes (QFTCS), and usual Quantum Field Theory (QFT) itself. My interest is in the fundamental physics...

Homework Statement Suppose we have spring which is between two bodies of different mass, with which force spring will act on every of them? Homework Equations Spring acts on a body with force kx The Attempt at a Solution A-/\/\/\/\/\/\/\-B Suppose body A has mass 2kg and body B has mass...

Hello! Can you tell me how to calculate the gravitational force between two extended inhomogeneous bodies? (In the general case, we don't know anything about the shapes, we only know the density of masses)

Hi to everyone There is a formula out there to calculate te distance between a mass that is in orbit arround anhoter fix mass? (And its deduction)

Is there a computer friendly list with the known bodies in the Solar System astroid belt, that contains their physical properties, position and velocities?

Why do bodies in free fall change position relative to each other? For instance in a vacuum with no external forces why can an apple fall towards the surface of the earth? If these objects aren't accelerating then are they considered at rest? And in what sense of the term 'rest'. I think I can...

Okay...I have a simple question that, if we apply a force to a wall, then according to F=ma, the wall should have some acceleration at all the points we are applying the force...My question is that since the wall does not move move back, does this acceleration only result in a slight deformation...

During a collision between a truck and a wall, an occupant of the truck is thrown forward because of inertia; he continues moving forward. Why does the occupant stop eventually? What is the resultant force that opposes his forward motion? Is this force the equal and opposite normal reaction...

Hello. I was thinking about gravity and how matter bends the ST (space time) creating gravity.which lead on to singularities. I wondered how much mass it would take to either make a hole in spacetime, or how much it would take to make a black hole. So I googled it. This is where my confusion...

Based on classical physics all things attract one another due to their own gravity pull, so theoretically the Earth is drawn closer to a tennis ball even if its impossible to detect. Knowing this and Einsteins theory of relativity of spacetime could I not assume then that every physical body...

I am trying to find an animation (from the internet) explaining the intricate balance of heavenly bodies (stars, planets, satellites, comets etc) in their own orbits. What happens if there is a sudden change in anyone of characteristics of those heavenly bodies. Is a small perturbation in...

Homework Statement Two bodies are standing still upon a surface without friction. The mass of body 1 is bigger than the mass of body 2. i) A constant force is applied to body 1, so it accelerates in a segment to a distance d. The force stops being applied to body 1, and is applied to body 2...

**This is more a general understanding question rather than a homework question** 1. Homework Statement So when you comb your hair trillions of electrons get transferred from your hair to your comb. So when trillions of electrons go missing how is your body able to maintain a neutral charge...

Hello Forum There are three different mechanisms to transfer thermal energy: conduction, convection and radiation. It is well known that when two objects having different temperatures T1 and T2 are in contact, they will eventually reach a common intermediate temperature (the weighted average...

Suppose we have a body of finite size which can be translated, rotated, compressed and stretched. We have every information about the body. We have its dimensions and everything. We have its mass and density. But, since I'm here talking about a completely generalized version, so we have variable...

1. The probleas statement, all variables and given/known data Two stones are projected from the top of a tower 100m high each with velocity of 10m/s. One is projected upward while the other is projected downward. Find the ratio of velocity's by with which they strike the ground. Homework...

Homework Statement A body of mass M is connected to a vertical spring.Another body of mass m is placed on it.Calculate the amplitude of the oscillation of that system,with the condition that the body m always stays on top of body M(no jumps).No friction. Homework Equations mg=kx mgh=0.5kx2...