rigadin

Two things:

1) optimize the launch angle (45 degrees assuming no air friction).

2) maximize the launch velocity. This means that you either make the arm longer, or the torque stronger, or both.

 

Depending on how your elastic bands work, you might not want to make your catapult like a real one that relies on twisting ropes, and instead make it more like a slingshot (if allowed). In any case, you want to use your catapult arm as a class 3 lever.

Hi, thanks for the help but I don't understand everything. Which part is the torque? what is a class 3 lever? thanks for your help

Hi guys,

at school there is a competition between all classes, we have to build a catapult with 300 ice cream sticks (popsicles), 5 elastic bands and 1 thin metal stick. we have to make a ping pong ball fly as far as possible. We already have a design but can you please help me with important details and things that make the ball fly far!

Thanks for your help

rigadin

Thanks a lot for your help

rigadin

Hi guys

It was a long time since I logged in last time but I am writing an essay about steel and I would like to know the physical charasteristics of steel. Like density, melting point, and percentage of carbon (I'm asking you because I get so many different numbers and I'm a bit confused:confused: )

At the same time if you feel like answering what is so special about an electric arc furnace?

Thanks for your help

rigadin

Hi

Is there a chance that this can happen:

When global warming has made all the ice melt will the earth turn faster or slower due to the centrifugal force made my all the extra H2O in liquid form?

I think this because the earth's rotation will bring a lot of the water around the equator.

And what can this lead to???

Everybody write and talk about global warming, Global warming this, global warming that and it is a problem just it dosn't seem like many people are doing something to stop it.....

Yes. It follows the same laws of physics. The details of the field geometry will be the only possible variable, but in any case it will comply with Maxwell's equations.

So if I got it right you mean that the only thing that is different is the shape of the magnetic field and everything else is the same? thanks!

Hi it's been a long time since I last logged in.

I have a really important question:

Is the magnetism around a magnet of the same sort as the magnetism around an electric line?????? If you don't understand my question just tell me.

This isn't the answer to your question but scientists have found a place in the universe where there is absoloutly nothing!

Forces are, after all's said and done, only a description of what actually happens. You can do all of Physics without the concept of force; it's just easier to use that idea at first. My advice - just accept them and use them.

But my teacher asked me to find out

"What happens if you follow a photon at the speed of light?" this a question that Einstein itself asked. And I agree that objects with rest mass cannot reach the speed of light, but according to Einstein's theory of Special Relativity they can reach 99% of it, and then the time dilation.

Anyway, I think that an answer has nowdays been provided to you and also to Einstein question. And that answer is "If you follow a photon at the speed of light, the photon moves away from you at the speed of light"

I understand that we can't go at the speed of light what does the light "see"?!

Objects with rest mass can't go the speed of light, so the question is moot.

What if it dosen't have a rest mass. What would "it" see? What does light "see"?

Thanks guys sooo much for helping me with all my questions. Now I understand so much more. I feel really free and comfortable to talk in this forum. I am a very curious boy and I like to learn more about my surrounding world. Anyway another queston: What do you think would happen if you go at the speed of light? Would it become pitch dark because you are ahead of the light? Would you see the light behind you????

I would want if you guys can tell me whyand how do forces occur??

Thanks:doh:

Somehow scientists have slown down light. I didn't read the whole article but I saw the headline. how did they do that?

1/ it is the quarks that make the protons and neutrons that are charged. charge is an intrinsic property of these particles like mass. electrons themselves have charge. it is again an intrinsic property.

 

2/ electrostatic charges. it works a bit like gravity but it is the electromagnetic force in this case. there are also some quantum mechanical effects at these scales which makes it more complicated. especially if you have anything above hydrogen.

What is a quark??

What is electromagnetic force made of?

Thanks

hi guys,

I have just started physics and i still don't understand 2 things about the construction of atoms:doh: !! I thought you could help. In a hydrogen atom, in the middle there is one proton (positive) and one neutron (neutral) and on the outside the is one electron (negative) who circles the core.

1. What are these protons, electrons and neutrons charged with?

2. What holds the electron in the special path around the core? Is it like the earth's gravity holding the moon in place with gravity?

Thanks for helping me!

P.S. You guys might think this is easy but I don't!!

I would assume the highest layer of the atmosphere but I could be wrong.

Please go on and tell me. It could give me a clue about where to look. I don't care if you're wrong. I will find the answer soon enough

There are maps of the ozone hole I believe, google is your friend there.

 

What do you mean by "in the world" and then "including space" by most definitions of world space is outside of it...

I mean the coldest place in the galaxy including earth! Does that help you?

I have a little question.

I have to do a project but to do it I need your help. All I need to know is where in the ozone there are holes and where is the coldest place in the world is, including space and the air between the atmosphere and the ground.

Thanks

P.S. Don't ask what I am doing, It is top secret until I'm ready. Only my father knows about it!!

I would without a doubt choose the maid!!

When I have to do my chores I hate washing the kitchen and the bathrooms and I hate vacum cleaning my room!

Where do you vote?

No I got it. I just didn't understand what the word mean!! But now I do. Correct me if I am wrong: The semimajor axis is like half of the length of the oval and the semimajor axis is like half the length of the height!

Thanks anyway

I will actually work in grade 9 maths next year but I would like to learn a bit more than I am supposed to!!!!!

Thanks