Acceleration Definition and 1000 Threads

I don't understand what I am supposed to do. I know how to find the acceleration of the system, but I am not sure how to find the com acceleration. My guess would be something along the lines of xcom = (m1a1*x + m2a2*x)/(m1a1 +m2a2). Then do the same for the y axis. Then to find the velocity all...

Starting from this post, we are able to define the concept of (proper) acceleration or rotation without any reference to something else About this definition which is the physical meaning of gyroscopes axes pointing in three mutually orthogonal spacelike directions ? In other words, from a...

I've been deriving ds, velocity and acceleration for an elliptic cylindrical coordinate system. When it comes to ds and velocity, its quite simple and quick. The acceleration however is tedious by my current method and I'm wondering if there is some shortcut or superior method I'm not aware...

Okay so I am having trouble understanding the relationship between Tension, Net Force, and Acceleration. For example, if two objects in a system are connected by a tension force and accelerating at the same speed, but with different forces acting on each object, would: 1. The net force be equal...

Helpp meee pleaseee

What I did was consider a circular orbit around the Sun. We'll have the comet's velocity tangential to its movement (vorb) and a radial velocity pointing towards the sun due to the ejected particles (vej). Therefore we can find the total velocity to be vtot=√(vorb^2 + vej^2). What I did after...

SOLUTION ATTEMPT Newtons 2nd law states that F=ma (eq. 1). When a force is applied to a mass m it results in an acceleration a=F/m (eq. 2). If a vertical force is applied to one of the objects in this system, acceleration of both objects will occur. Assuming the length of the rope is constant...

Hello, Wanted to know if this was the correct approach to solve this example. I uploaded the question along with an attempt. Thanks in advance.

Note: Maths has always been kinda a weak point for me in school. Anyway. From hereon I'm going to talk about this in the context of a train for simplicity, even though this is actually needed for an entirely different context - but I don't think this is relevant for the problem. In terms of my...

Hi guys, I feel that this question has a very straightforward answer but I am just not quite grasping it. The first picture is the homework question, the second is the free body diagram I drew. I know that a = F/m and I know the solution should be: a = (P - m1*gsinθ - m2*gsinθ) / m1 + m2...

So I first wrote the moment of inertia of the cylinder, since it says that it is thin-walled, I think that its moment of inertia is ##I=\eta mR^2##. After that I wrote the sum of torques, I think that there are three forces that cause torque, the two forces of friction, the one caused by the...

Recently I am learning about electrodynamic radiation and its various types, and it occur to me that since the form of the magnetic field created by the dipole radiation is some combination of cos(wt), 1/r, and cos(kr) (take the approximation of r >> c/w) Therefore, if there is a metal placed...

I already solved the first part, but according the my book, the answer isn't quite correct. This is what I did. Finally, I ended up with ##a=\frac{F(r-R\cos\alpha)}{Rm(\gamma+1)}##. But according to my book, the answer is ##a=\frac{F(\cos\alpha-\frac{r}{R})}{m(1+\gamma)}##, what am I doing...

I am working with Magnetic strips to get countinous force in both clockwise and anticlock wise direction. I am looking for better concept for hand free mode in my experiment. The pdf file of my experiment is attached .

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...

no idea

I think I am on the right path but I'm having trouble cancelling out the mass of the wallet. I drew a free body diagram and know that there are three forces acting on the wallet: gravity, friction, and normal force (including the van's acceleration). The y-component of the friction and normal...

I figured that we would simply add up the forces acting on the electron (the electric force Fe and the magnetic force Fb) and then equate this to the given acceleration multiplied by the mass of the electron like so. vector Fe + vector Fb = (mass of electron) (vector acceleration) since vector...

Hello. I have a question on inertial motion transverse to gravity force, e.g. blocks of dry ice floating on the smooth and flat floor on Earth. For simple mathematics I explain my problem in Rindler case. Let a group of N rockets gather at origin (0,0,0,0) of a IFR and let them start...

KE = 100eV x (1.6x10^-19) v(new) = √(2KE/9.1×10^-31 ) = 5.9x10^6m/sv(original) = h/λm = 6.6x10^-34 / (0.2x10^-9 x 9.1x10^-31) = 3.64x10^6m/s

Equation 1: T = Ma1 Equation 2: mg - 2T = ma2 Equation 3: a1 = 2a2 Since a1 = 2a for equation one I get T = 2Ma1 mg - 4Ma1 = ma1 mg = 4Ma1 + ma1 mg = 4a1(M+m) a1= mg / 4M+m Not sure if this is correct. Can someone please help to make sure I'm doing this right? Thanx

PART B ONLY: The cylinder undergoes torque when the mass m2 is removed: τNET = Iα = FNETr = 45α = FT(0.5) FT = 90α, therefore msystem = 90 kg After this step, I am not sure what to do. τ = ΣF = Fg - Ft = ma = (20 kg)(9.8 m/s2) - (90α) = 196 -...

Hello, 1) Suppose I throw a ball with a force ##F=ma##, the instant it leaves my hand, does it have the same acceleration ##a## added to it accelerations due to "ambient" forces (air resistance, gravity..)? 2) If I am right about 1), doesn't my hand already carry the acceleration/deceleration...

How would the acceleration of our sun relative to our galaxy be determined? A spaceship in orbit around our sun, with engines turned off, is in free fall. Accelerometers will read zero. Turning the engines on, the accelerometers will read the acceleration due to the thrust from the engines...

Homework Statement The graph shows the variation with time t of the acceleration a of an object (graph attached). What is the change in velocity of the object in the time interval 0 to 4s? Homework Equations a = v/t The Attempt at a Solution My initial answer was -8 m/s, by simply finding the...

Homework Statement A man with a mass of 65kg is traveling in an elevator and stands on a set of scales, at a given instant the scales measure his weight to be 72kg, find the acceleration of the equation Homework Equations f=ma w=mg FN =mg+ma[/B] The Attempt at a Solution [/B] I know that...

Homework Statement The problem is in the image attached below 2. Homework Equations In the working below (although I think I have misunderstood a concept) The Attempt at a Solution My attempt is in the attached image. I tried to leave the numbers out until the end. I have not written...

Homework Statement A 5.21 kg block is sliding down a slope at an angle of 4.22° to the horizontal. The block is initially moving down the slope at a speed of 1.45 m s−1 and the coefficients of friction between the block and slope are, μs = 0.500, and μk = 0.100. Find an expression for the...

Would it be possible for a person in a lift to know if he is in a gravitational field if he measures the gravitational acceleration at the bottom of the lift versus the top as they would differ since gravitational field strength would be different between the bottom and top. In an accelerating...

Homework Statement Three particles A, B, C, are situated at the vertices of equilateral triangle of side l. They approach each other with velocity v, such that A always moves toward B, B towards C and C towards A. What will be the initial acceleration? Homework EquationsThe Attempt at a...

Is there a correlation between acceleration and velocity? If acceleration is rising will the velocity also rise?

Hi Folks, I am a private tutor and one thing I teach is A level Physics (OCR Physics A). Am I the only person who has been sometimes baffled and deeply disappointed with some of the questions/answers? Let me explain what I mean. I see questions form which it's not possible to decide what kind...

Why ##d^2 x^\alpha / d\tau^2## is not considered a good expression for the proper acceleration (of a massive particle whose proper time is ##\tau## and coordinates are ##x^\alpha##)?

A microwave transmitter, bouncing the microwaves off a parabolic dish, should have a small amount of acceleration due to the reaction of the microwaves against the dish. Would an arrangement of two dipole antennas, 1/4 wave apart and phase shifted by 90 deg., creating a cardioid pattern...

I'm a bit confused as to why the speed of light changes in an accelerating ship relative to an onboard observer. In other words, on a ship with a clock at the nose and a clock and observer at the tail, in an accelerating ship, the clock at the nose will tic faster. The reason (according to a...

Hi, How to calculate the position in time by applying a force, like a Thrust, not in the center of mass: I only know about the linear and angular formulas: Pos/rotation = 1/2 * F * Time^2 I have struggled finding topics about this maybe because i don't know the correct nomenclatures and maths.

Homework Statement Given the picture: Make the free body diagrams of each body and the pulley. Remember that there are two different strings therefore there are two different tensions.Assuming that the mobile of mass M starts from rest and has a displacement D at a time t, and the bodywith...

Homework Statement We need to calculate value for the acceleration due to gravity. We did a test were we dropped a ball from x height and recorded it. Ball 1 0.65 0.82 0.95 0.79 0.81 0.9 0.91 0.85 0.76 Avg - 0.844 Homework Equations Displacement formula The Attempt at a Solution I've...

Homework Statement Question: A 600 g steel block rotates on a steel table while attached to a 1.20 m-long hollow tube. Compressed air fed through the tube and ejected from a nozzle on the back of the block exerts a thrust force of 5.01 N perpendicular to the tube. The maximum tension the tube...

I read in Wikipedia that "For supernovae at redshift less than around 0.1, or light travel time less than 10 percent of the age of the universe, this gives a nearly linear distance–redshift relation due to Hubble's law. At larger distances, since the expansion rate of the universe has changed...

In an inertial frame, consider that a particle's position and the time measured by a clock in this frame are respectively, ##(t,x)##. Suppose there's another frame, moving with constant speed ##v_R## with respect to the frame described above. The particle acceleration is given in the first...

My smartphone has an accelerometer inside it. Does the phone itself and the proof mass of the accelerometer feel the same acceleration OR do they feel the same force, when I apply a force to my phone? I think they feel the same acceleration, F=ma. Force felt by proof mass and the force felt by...

The thing is in page p.347 Taylor, it is said that the component is: g_tan = Omega^2*Rsin(theta)cos(theta) However the angle between the centrifugal Force and the axis normal to the direction of the grav Force is actually 90 - theta, I am not really getting where I am going wrong understanding...

Alright so I was just messing around with Lagrangian equation, I just learned about it, and I had gotten to this equation of motion: Mg*sin{α} - 1.5m*x(double dot)=0 I am trying to get velocity, and my first thought was to integrate with dt, but I didn't know how to. And I'm not even sure it's...

My question is kindof related to physics, as I have an Accelerometer sensor through which I am able to get the sensor data as following: x = 192 y = 433 z = -453 I need to convert these values in such a way so that It will share Acceleration in cm or meters, And also what concept I should use...

Homework Statement At a construction side, a small crane is raising two boxes of nails on a plank to the roof. One box has already been opened and is half full, while the other box is new. The boxes, including the nails, weight 10 kg and 20 kg, respectively, and are the same size. Diagram...

Hello, In 2D kinematics, the acceleration vector ##a(t)## can be expressed either in Cartesian coordinates ##a_x## and ##a_y## or in polar coordinates ##r## an ##\theta##. It depends on the problem. But it is also possible to express the acceleration ##a(t)## in the so called "intrinsic...

In reviewing one of Einstein's thought experiments, the accelerating elevator in space, and the resulting bending of light passing through the elevator, Einstein's predicted that light will bend in gravity. Now Einstein's original prediction was off by a factor of 2 because he hadn't yet...

Homework Statement The acceleration of a particle given a=A√t where A=2.0 m/s5/2. At t=0, v=7.5 m/s and x=0. (a) What is the speed as a function of time? (b) What is the displacement as a function of time? (c) What are the acceleration, speed, and displacement at t=5.0s. Homework EquationsThe...

a disc or radius r = 16cm starts spinning from rest with a uniform angular acceleration of 8.0 rad/s^2. at what time is its tangential acceleration twice the centripetal acceleration. i figured out the tangential acceleration is: Atan = α/R = 8 / .16 = 50 m/s^2 and the centripetal...