Accelerating Definition and 669 Threads

Does speed of light Change with respect to accelerating frames It shouldn't be as gravitational time dilation exists

hi... a rocket of mass M is flying through a dust cloud the cloud has a density of P. the rocket's cross section is A. every dusticle the rocket colides with becomes permenantly attached. the rocket is ejecting material (as a propellant) at the same rate that it assimilates it. the speed of...

I wish to accelarete out into space at 9.8m/s/s for 1 day. The reason I want to accelerate at 9.8m/s/s is because I want to feel the normal effects of gravity as I travel. After accelerateing for one day, I want to look out my rocket window, and take a snap shot of our sun, then I want to...

Homework Statement Why is helium balloon in accelerating car tilting forward? Homework Equations The example that I think that I understand - is simple pendulum in accelerating car - and everything there is clear - g(effective)=g-A (all of them are vectors). The Attempt at a Solution So...

I have a question for homework, and this is a high school physics class. The question reads: Suppose that you are standing on a train accelerating at 2.0m/s^2. What minimum coefficient of static friction must exist between your feet and the floor if you are not to slide? I've drawn a free...

"As your jet plane speeds down the runway on take off, you measure its acceleration by suspending your yo-yo as a simple pendulum and noting that when the bob (mass 40g) is at rest relative to you, the string (length 70cm) makes an angle of 22 degrees with the vertical. Find the period T for...

We start with a non accelerating long rocket having a clock C1 and photon source S at the front and a mirror M at the rear - photons are emitted at timed intervals recorded on C1 and their return is measured by C1 - so the round trip time for the rest frame is established. The rocket is then...

I seem to be specializing in plumb bobs this week:rolleyes: A box car has a freely hangling plumb bob (from the ceiling). It is accelerating up an incline. which makes an angle b with the horizontal. The plumb bob makes an angle c with the perpendicular to the ceiling. Find the acceleration...

a boat moves through the water with 2 forces acting on it. one is a 2021N forward push by the motor on the propeller, and the other is an 1774N resistive force due to the water around the bow. What is the acceleration of the 1146kg boat? Answer in units of m/s^2. would i use a=f/m for this...

This seems like an easy problem but my answer is incorrect. Imagine a boxcar traveling up a 9.85 degree slope with constant acceleration a. In the boxcar is a pendulum that hangs 24.05 degree from the perpendicular to the boxcar's ceiling and floor. Find the acceleration. It seems to me that...

I'm pretty sure this is an easy problem but I don't know what formula to use - At the local grocery store, you push a 16.2 kg shopping cart. You stop for a moment to add a bag of dog food to your cart. With a force of 12.0 N, you now accelerate the cart from rest through a distance of 2.02 m...

Two blocks are fastened to the ceiling of an elevator. The elevator accelerates upward at 1.70 m/s2. The blocks both have a mass of 11.5 kg. Find the tension in each rope. ______________________ ....| ....| ....| ...__________ ...|...| ...|...| ....| ....| ....| ...__________...

energy and mass both exert gravitational force right? so the question "will a very fast object become a black hole" isn't answered by saying that the rest mass doesn't change right? I remember asking this question before and being told that it wouldn't since the rest mass stays the same when...

A car starts from rest and accelerates uniformly for 6s. The distance traveled in the 6s is greater than the distance traveled in the 1st second by a factor of what? how would i go about doing this?

I have heard that people say the universe is accelerating, however i cannot find direct evidence of these claims anywhere. What has led people to believe that the expansion of the universe is accelerating?

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...