Accelerating Definition and 654 Threads

Alright, so before I start off, I just want to say that I'm not very far into my physics career, but as I was reading on the forums here, I got to thinking about something...but, before I say my thoughts, I want to apologize if it's a stupid question. But here it goes: So, I was reading on...

In Special Relativity, If an inertial photon emitter, A, emits photons every second and an observer, B (moving away from A at a constant velocity v), intercepts these photons and instantaneously reflects them back to A then we would expect to see the Doppler redshift effect. My question I...

I was given this as a practice problem: A 1,000 kg car accelerates from rest to 25.0 m/s in 7.50 s. What is the Average power? So far, I know that P= FD/t F=ma m=1000kg initial velocity = 0 final velocity = 25.0 m/s t = 7.50 s how do I find the acceleration? thx

Einstein’s Cosmological Constant was inserted into his General Relativity equations to make the universe static, neither expanding nor contracting, as most physicists believed it was at that time, as his equations showed that the universe is unstable and would eventually contract into a single...

I have various classical mechanics books but none covers this subject. Even Goldstein doesn't. Can someone suggest a book or online resource on the subject?

I have always wondered about something as i went along through my studies. I was wondering what would happen if you isolated kids from the educational system and taught them at accelerated rates (say, expect them to learn in 1 year what they would normally learn in 2 or 3 years in a normal...

I've heard that in the late '90s two independent groups discovered experimentally that the expansion of the universe is in fact accelerating, which might imply a non-vanishing cosmological constant in Einstein's relativity. So first of all, can anyone provide some more information about these...

An elevator weighs 10000N. What is the tension on the line when the elevator is accelerating upwards at 3 m/s? I don't know how to go about this one. Any help?

I'm having difficulty with this whole concept I understand that the Lorentz force is the force acting on a charged particle in a magnetic field, and that it is the resultant of the forces due to the electic field and the magnetic field. The situation which I am applying this to is a...

A 2 dimensional circle of radius "r" and mass "m" is attached through the center of the circle by a rigid, massless rod to a fixed point of rotation a distance "l" away. A massless rocket is attached to the outside of the circle a height of 0 away from the circle's surface and "r" away from the...

hello, consider an plane inclined at an angle theta with a block on it. the problem asks me to find a horizontal acceleration such that the block will not slide down the plane. in part (a), friction is neglected, in part(b), friction is considered. here is what i have done. i fixed the...

I can't figure out the correct explanation for this gedanken. 1) We have a room in deep space which is shielded from external EM fields. The walls are lined with photon detectors. Inside is a charged ball attached to an insulating rod. The other end of the rod is on an axis and the rod is...

What is the difference in magnitude between the effects of normal doppler effect and doppler effect in accelerated frames, e.g. when the (light)source is accelerating wrt the observer? What is the formula for doppler effect in accelerating frames?

A 2.1 X 10^-4 kg spider is suspended from a thin strand of spider web. The greatest tension the strand can withstand without breaking is 2.0 X 10^-3 N. What is the maximum acceleration with which the spider can safely climb up the strand? Fnet = ma = (2.1 X 10^-4)(a) < 2.0 X 10^-3 a < 9.52...

Is acceleration due to Gravity true? I know it is a simple question, but I have other questions based on this.

Hi to all, I have two questions concerning neutrons. How is it possible to accelerate neutrons? Since they have no charge, it shouldn't be possible by applying an electric field. I read somewhere that it should work by using a magnetic field. Can somebody explain how that is working? I mean...

A car of mass 880.0 kg accelerates away from an intersection on a horizontal road. When the car speed is 13.8 m/s, the net power which the engine supplies is 3700.0 W ( in addition to the extra power required to make up for air resistance and friction). Calculate the acceleration of the car at...

A 5.5-kg object is suspended by a string from the ceiling of an elevator that is accelerating downward at a rate of 2.5 m/s^2 What is the tension in the string?

Find the tension ( stretching force) on the string whie system is accelerating. I know that the pull on block "A" for acceleration is gm2 / m1 + m2. so what is the source of the kinetic energy store in block "A". :confused:

Hey there, My boyfriend is going to be coming home in roughly 3 weeks. I was wondering if it would be possible to lose and inch or so off my waist before he comes home. Is that a realistic achieveable goal? :rolleyes: Your thoughts would most appreciated. Suggestions on how to do this would...

According to source i read, in classical theory it its believed that charged particles radiate when the accelarate - but do they have to be accelerating or can they just be moving? So if we had an electron gas, each time "collision occured" light would be radiated as the particles decellerated...

Hi mates. I was doing a practice exam and I came across an interesting question. Calculate the work done accelerating a proton to a speed of 6.00*10^7 ms^-1 from rest. Proton mass = 1.67*10^-27 How would I go about solving it?

I had a thought the other day that I would quite like feedback on: Could the universes accelerating expansion be fuelled by the amount of mass in the universe decreasing? Is it possible that a black hole could become so massive that it tears away from/gets pinched off spacetime, how much mass...

A quick question for those fast with the GR and SR math. Assume you get in a spaceship and start accelerating away from Earth, and during the trip you and the people left behind compare clock speeds periodically (not elapsed time, but rather tick rates). At what combination of acceleration...

http://img258.echo.cx/img258/4409/lift3ad.png A painter in a crate hangs alongside a building. When the painter, who weighs 1000 N, pulls on the rope, the force he exerts on the floor of the crate is 450 N. If the crate weighs 250 N, find the acceleration. (ans=1.96 m/s²) Lift...

where does all the extra space come from ? ie... the stuff that is forcing objects to become further apart at speeds exceeding light particularly in the early universe stage was it present at big bang ?... I don't think so cos that is what inflation is, rapidly expanding space is it being...

Are the questions a) why does an accelerating charge radiate and b) why does an uniformly accelerating charge not radiate satisfactorily answered and accepted by the physics community? or are there still some unresolved inconsistencies in theory regarding this? I read two...

Our Physics review sheet includes two questions involving "accelerating voltage", "deflecting voltage", and "screen deflection", which are involved with Cathode Ray Tubes. The chapter on this in the book basically outlined what one was and how it worked, but it did not make use of any of these...

Guys, this is a difficult one for me to solve but I hope that with your help I can get an answer. Please tell me how you arrived to the answer. The problem: We let a ball with a mass (m) of extreamely small radius fall from the top of a spheare with a radius (R) which is resting on a...

Ok these are a couple of strange questions. If you were traveling at a constant speed eg, 30mph and you hit someone, would it do more damage to them than if you were accelerating towards them up to 30mph when you hit them? And this one, I know what the answer should be but I can't get my...

Is there some law to calculate the details of radiation emitted by an accelerating charge?

I did this question several times and all I get for acceleration is negative 9.8... static friction for the top block is .60 and kinetic friction for the bottom block is .20... The force is making both blocks move a distance of 5 meters starting from rest. They want to know What is the least...

An electron is accelerated through a potential difference of 240V, what is it's speed? I used energy conservation to find it. So, here's what I did: 0 = \frac{1}{2} m\Delta v^2 + q\Delta V 240V*(1.6*10^-19C) = \frac{1}{2} * (9.1*10^-31kg )* V^2 V = 9.2*10^6 m/s Is this correct...

Hello all! I have a question on acclerating frames. The apparent weight of an object in an elevator that is accelerating upward is m(g+a), where g is gravity and a is the acceleration of the elevator. In my textbook they give an example of a crate placed on a scale at the equator. They want...

I have a problem (it was homework, but I already turned in my wrong answer) dealing with a block stationary on an accelerating inclined plane. There is a force applied horizontally to the inclined plane, which has an angle of 35 degrees above the horizontal. A box of mass 0.5 kg is on the...

This problem is keeping me up all night, I did what I thought was right to figure out the force needed but the answer sheet tells me that my solution is wrong, spend 4 hours trying to figure out what I did wrong can't come up with anything: A 280kg box slides 4.3m down a 30 degree incline and...

I am having difficulties finding an acceptable rationale for my solution to Problem 41 of Chapter 5 from Physics for Scientists and Engineers, 4th edition, by Paul A. Tipler: Lou has set up a kiddie ride at the Winter Ice Fair. He builds a right-angle triangular wedge, which he intends to...

I am having difficulty solving Problem 105 of Chapter 4 from Physics for Scientists and Engineers, 4th edition by Paul A. Tipler: The pulley in an Atwood's machine is given an upward acceleration \overrightarrow{a}. Find the acceleration of each mass and the tension in the string that...

The driver of a pink Cadillac traveling at a constant 60 mi/h is being chased by the law. The police car is 20 m behind the perpetrator when it too reaches 60 mi/h, and at that moment the officer floors the gas pedal. If her car roars up to the rear of the Caddilac 2.0 s later, what was her...

Here is a discussion Question : Overlooking the planet's own motion, why is it likely that everything moving for any appreciable distance on the surface of the Earth is accelerating? Pleas help me with this question. I think it's talking about acceleration due to changing the velocity...

Seen in another thread: Does this implies that a spaceship, inside a black hole, accelerating in the direction OPPOSITE to the singularity would actually accelerate TOWARDS the singularity? Or does it simply mean that no matter how fast a speed he reaches through his acceleration, he would...

if, say, an electron is stationary on Earth (ignore the probability or possibility of this for now). it, of course, is not emitting any EM radiation. However, an observer in space (stationary with reference to the sun) is looking at the electron. relative to them, the electron is accelerating...

As the universe expands and disperses, there is less of a gravitational well for photons to climb out of before they reach us. Photons from the early universe must climb out of the gravity well of a more densely populated universe than photons emitted from sources today. Therefore early photons...

A car, initially still, accelerates up to a maximum speed of v, and then slows down to a stop again. The plot of the velocity over the time (t seconds from start to stop) is a semicircle. (i'm sorry i cannot post the diagram, but try to imagine it, it is a simple semicircle where the topmost...

What if... Gravity is the consecuence of mass deforming space-time. But why mass deforms space-time? What if gravity is the consecuence of mass inertia in an accelerated universe. I can imagine a universe expanding at an accelerated speed that is being deformed by the inertia of the objects...

Two frame of reference A and A'. A' starts accelerating with respect to A. The distance of separation of the two frame of reference is s = 1/2 at^2 x' = x - s = x - 1/2 at^2 Differentiating twice with respect to time we get d^2x'/dt^2 = d^2x/dt^2 - a d^2'x/dt^2 + a =...

I read in Brian Greene’s book that a founding principle of Einstein’s SR/GR theory is based on… the laws of science should remain the same for all freely moving (non-accelerating) observers. I have read that a few times before but worded a little differently. My question is, does this mean...

An electron is accelerated through 1800V from rest and then enters a uniform 2.90T magnetic field. What are the maxium and minium values of the magnetic force this charge can experience? Ok someone help me out here...not sure of the equation. How do the formulas for a magnetic force differ...

1. Let clock A and clock B be of identical construction, and let them both not be subjected to any force. Let them be at rest with respect to each other. Thus, the relative velocity v is equal to zero. Therefore, using Newtonian mechanics or SR, the clocks tick at the same rate. For the...

Allright, this isn't exactly a K-12 question, but I am trying to learn something on my own, since I don't think I learn enough at my school. Anyway, I am working with Basic Physics secound edition, and I really need some place to ask for help since I am stuck. I have come to a place, where I...