1

Physics, Astronomy & Cosmology / Does speed increase force?

« on: 18/03/2013 16:14:24 »

if you were to spin a ball inside a circular tube at some point the tube would brake due to the momentum the ball gains which pushed on the inside of the tube.

now here's where my question comes in.
would the circular tube break at a later point in time if it were traveling through space really fast?
in other words, does the strenght of the tube increase if i speed it up. much like certain particles will decay slower when traveling at great speeds.

thanks and sorry for my lack of better words.

2

Physics, Astronomy & Cosmology / how do forces resolve

« on: 09/10/2012 01:34:17 »

in a picture i have very poorly drawn a shape.
how do the forces resolve in the u turns if a ball starts on both outside parts of the tracks

3

Physics, Astronomy & Cosmology / How do forces resolve?

« on: 20/09/2012 18:27:17 »

if an object is traveling forward in a straight line and experiences a sideways force both left and right of equal strenght. does this cause this speed in the forward direction to lower?

i think an example would be the following
If a car is going forward and 2 kids on the backseat throw a ball to eachother of equal weight at the same time. does this lower the speed of the car in the forward dimension?

4

Physics, Astronomy & Cosmology / gravity, electromagnetism and flying

« on: 04/09/2012 20:14:24 »

Hi guys,

i have a pretty simple straightforward question for you all:
gravity is what keeps us tied to this planet however time after time now i've heard "gravity is weak, look this magnet can pick up this weight with no problem even though the entire earth is pulling on it".
So if magnetism is so much stronger than gravity why don't we use it to fly?

now before leaving you with this question i'd love to correct myself because we do in a way use magnetism to fly, we have some sattelites going for the outer edge of our solar system by slingshotting themselves using the planets to do so.

5

Physics, Astronomy & Cosmology / How is the appearance and disappearance of particles in empty space measured?

« on: 11/07/2012 23:51:17 »

When it's said that particles spontaneously come into existance at a quantum level and then pop out of existance i asume this has been somehow meassured in a vacuum on earth. Is it also possible to view the same phenomenon in outer space and has this been done?

6

Physics, Astronomy & Cosmology / When were the first black holes?

« on: 28/06/2012 04:55:54 »

could black holes have existed earlier than currently accepted because of the different properties of a early universe?

7

Physics, Astronomy & Cosmology / How does an astronaut moving inside a spaceship affect the craft's own motion?

« on: 12/06/2012 03:59:11 »

i've seen a video of a guy running inside a satellite where there was a matras thingy sitting on the walls and a large stick in the centre which he could hold. i was wondering how his running in the satellite would affect the satellite asuming, let's say, it has the shape of a cilinder.
so to clear it up: he runs on 1 circle on the inside wall of the cilinder, i dont know the exact weight of the satellite but its much bigger than his own weight ofcourse.

8

Geek Speak / Are there any good physics simulation programmes?

« on: 11/06/2012 18:32:02 »

Are there any cool physics programs / games out there that allow me to simulate any theories for devices i come up with?
I'd figure there are since we have programs that attempt to understand / recreate the big bang but i don't know of any.

_{Mod edit - formatted the subject as a question.  Please do this to help keep the forum tidy and easy to navigate.  Thanks.}

9

Physics, Astronomy & Cosmology / From a physics perspective, what happens when two objects collide?

« on: 02/06/2012 19:55:37 »

If 2 objects collide 1 moving at a relatively low speed and the other at a freaking high speed how does this affect the results on impact?

I heard you can use a banana to shoot through wooden sheds if you fire it with sufficiently high speed for example, and that would be under the condition where you'd have air resistance. Is there a limit to this except for maybe light speed?

10

Physics, Astronomy & Cosmology / How would a maglev system behave in space?

« on: 01/06/2012 23:20:39 »

If i take a maglev like rails which is formed in a circle, in what different shapes could it move in space saying the weight of the system is 80 Kg. the mass of projectile inside is 20 Kg. and there's no huge limit on the propulsion that can be delivered to the projectile inside.

i'd like to start with this configuration and add some variables after there is some agreement about what can happen in this sistuation.

11

Physics, Astronomy & Cosmology / How does time change as one approaches the speed of light?

« on: 18/05/2012 01:05:29 »

I'm having trouble understanding what the speed limit means because as far as i understand it works like this: as you speed up time slows down on board. Thus if you measure speed by distance moved / time than doesnt this allow you to override the speed of light?

12

Physics, Astronomy & Cosmology / Is outer space equivalent in density to a man-made vacuum?

« on: 09/05/2012 22:53:17 »

I would like some help with the following:

Is (outer)space more empty than a man made vacuum? If so, does this influence the maximum speed allowed inside this vacuum?

13

Physics, Astronomy & Cosmology / some questions about superconductivity

« on: 29/03/2012 15:48:58 »

i would like to know some more about superconductivity and my searches havent yet brought me what i was looking for.

when a heavy metal is floating freely on a superconductive track which is NOT flat by has up's and down's in its track then by how much would the height of the floating metal be effected by a downward motion increasing it's speed. in other words: how strong is the resisting force between the metal and the track.

in speeding up a maglev train accelerating to top speed seems to take quite some time, why is this? Is the acceleration rate of the propulsion system so low and is it only achieving high speed through less friction or is there something else going on?


thanks in advance

14

Physics, Astronomy & Cosmology / Is the universe expanding uniformly?

« on: 24/03/2012 18:51:38 »

In most of what i read and see on the universe there is a mentioning of how we are surprised that our universe is still expanding.
To me however it's more surprising that the center isnt expanding faster and stuff isnt coliding through this effect, what causes this stability?

15

Physics, Astronomy & Cosmology / Where does all the light go?

« on: 24/03/2012 17:10:37 »

all of the light coming from our stars since the time there have been stars, where does it go?
im wondering about this alot lately, some help would be much appreciated.
and one more question, is it safe to say that since it has energy light also has weight, although very little.

16

Physics, Astronomy & Cosmology / Could a maglev-based system be used to get things into space?

« on: 21/01/2012 13:26:00 »

current idea:
Using a maglev like system (imagine a maglev train propelling system) in a circular like shape to move away from the earth.

let me explain what i'm thinking:
if you use a maglev system to shoot a heavy metal like object towards the earth (inside the circle or outside doesnt matter much, i think the only thing that matters is the fact that the metal like object and the system exchange kinetic energy with eachother)  (downwards) it will force the system upwards into the air for a shot distance.
Ofcourse this isnt entirely true because it would mostly make the cirle like object counter rotate compared to the object it is propelling. This however can be countered by connecting it to a 2nd one moving in the exact opposite fashion, then it would translate into a upward movement like i started out with.
so the minimum number you'd have to use is 2.

All there is left now is the part where the object moves upwards instead of downwards.
When this happens the kinetic energy would be aimed downwards if you accelerate it, thus we decellerate it so it still becomes an upward motion. This is limited to the point where the heavy metal wouldnt reach the top and cross it but instead fall back, so there is only a limited amount of energy you can aim upwards during this phase.
In the phase where the heavy metal is moving down this is only limited by the force you can put into the heavy metal.
the only question remains, would it be enough?
this depends on: the total mass of the maglev like circle and whatever extra weight comes with supplying energy and whatever space humans might need inside VS the weight of the metal object and how fast you can make it go.
If i look at the incredible speeds that can be reached using these type of systems it would seem likely it's possible to make it, it's also energy efficient.

Let me know what you think

17

General Science / What rate of acceleration can be achieved with a Maglev system?

« on: 05/12/2011 17:30:10 »

I was wondering about the acceleration rate that can be achieved using a maglev system.
I know a maglev can support crazy weights (as in it can keep the weight of the train it has to support suspended above the ground) but i dont know at which rate it can accelerate an object.
A link supplying me with more info on maglev would be very sweet too.

thanks in advance

18

General Science / How much mass can an electromagnet support, and where is the force applied?

« on: 04/12/2011 11:17:44 »

hi there i have some questions about magnetism and electro magnetism,
In using an electro magnet how strong can humans make it, as in what would the weight of the total electromagnetic construction be in comparison to the weight the magnet could attract.

my 2nd question is the following, if we make a maglev train construction where the weight of a train is being suspended above the ground, does the weight register on the ground below it (the maglev construction carrying the train)?

thanks in advance