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My oh my... Help me with Physics! - October 5th 2009, 12:14 AM

My brain feels like it's going to explode!
I'm only going to post one problem and hope to god that any help with that can help me with the other 5 or 6.
I don't understand a thing...

Do not just give me an answer, I need explanations and any equations you use.
From what I can tell I can't use F=MA unless I'm missing something.

4. Scientists are experimenting with a kind of gun that may eventually be used to fire payloads directly into orbit. In one test, this gun accelerates a 5.0-kg projectile from rest to a speed of 4.0 x 10^3 m/s. The net force accelerating the projectile is 4.9 x 10^5 N. How much time is required for the projectile to come up to speed?

Any help is appreciated.


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Re: My oh my... Help me with Physics! - October 5th 2009, 01:13 AM

You can use F=MA, using it you find the acceleration

A= F/M = 4.9 × 10^3/5.0 = 9.8 × 10^4m/s

and from V=AT we find time
T= V/A = 4.0 x 10^3/ 9.8 x 10^3 = 0.041s

I think that's how you do it.



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Re: My oh my... Help me with Physics! - October 5th 2009, 01:26 AM

Correct I believe... Haha bit slow on that one couldn't quite work out how the acceleration was so high.... then I saw it was a gun



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Re: My oh my... Help me with Physics! - October 5th 2009, 01:55 AM

I have a quick question--
Is there any other way to get the time? My stupid book doesn't have that equation and it's only using F=ma.
I'm so confused, it makes sense what you did, and I understand. But my textbook is so complicated.


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