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1. ## maximum strength in a catapult

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
2. ## maximum strength in a catapult

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

4. ## What are the physical charasteristics for steel?

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
5. ## The earth turning slower or faster??

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???
6. ## Artic temperatures highest in 2000 years

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.....
7. ## magnetism

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!
8. ## magnetism

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.
9. ## What Was There Before The Universe, And Where Does Space Goe

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

But my teacher asked me to find out
11. ## Speed of light

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

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

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????
14. ## forces

I would want if you guys can tell me whyand how do forces occur?? Thanks:doh:
15. ## Slowing down light

Somehow scientists have slown down light. I didn't read the whole article but I saw the headline. how did they do that?
16. ## What are the neutrons, protons and electrons in an atom charged with?

What is a quark?? What is electromagnetic force made of? Thanks
17. ## What are the neutrons, protons and electrons in an atom charged with?

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!!
18. ## temperatures and the ozone

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
19. ## temperatures and the ozone

I mean the coldest place in the galaxy including earth! Does that help you?
20. ## temperatures and the ozone

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!!
21. ## Which robot would you choose?

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!
22. ## SFN User Awards - Vote Now!

Where do you vote?
23. ## Geometry

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
24. ## Geometry

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
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