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Bon
Black Belt
Joined: 10 Aug 2001
Posts: 1047
Location: Australia
Styles: BJJ, Kickboxing
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 Posted: Sat May 04, 2002 6:52 pm Post subject: |
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A stone is thrown a distance of 85m at an elevation of 31.5(degrees) to the horizontal. What was its original speed ?
Anyone know ? The distance is horizontal, as far as I know...
_________________
It takes sacrifice to be the best.
There are always two choices, two paths to take. One is easy. And its only reward is that it's easy.
[ This Message was edited by: Bon on 2002-05-04 20:54 ] |
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van_damme
Orange Belt
Joined: 13 Mar 2002
Posts: 210
Location: London England
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| Posted: Sun May 05, 2002 10:22 am Post subject: |
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Well ill have a go at this,i like physics.
Speed = distance
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time
So im gonna substitute time for The degrees thing.
Speed = Distance
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Elevation (Or whatever)
Speed = 85m
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31.5
Speed = 2.7m/s
I hope im correct. |
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YODA
Black Belt
Joined: 25 Jan 2002
Posts: 1033
Location: England (int'north west)
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Bon
Black Belt
Joined: 10 Aug 2001
Posts: 1047
Location: Australia
Styles: BJJ, Kickboxing
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| Posted: Mon May 06, 2002 1:44 am Post subject: |
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I worked it out..
Let u = orginal velocity
Rx = u²sin2(theta)/g
85 = u²sin2(31.5)/9.8
85*9.8 = u²sin63
u² = 833/sin63
u² = 13.22
u = +/- sqrt(13.22)
Btw, they are good sites YODA.. The first one practically covers everything on projectile motion we need to know. How did you find them ? Whenever I search for physics related stuff on the 'net, I never find anything good.
_________________
It takes sacrifice to be the best.
There are always two choices, two paths to take. One is easy. And its only reward is that it's easy. |
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YODA
Black Belt
Joined: 25 Jan 2002
Posts: 1033
Location: England (int'north west)
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| Posted: Mon May 06, 2002 2:04 am Post subject: |
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Guess I'm just good at searching 
What search engine do you use?
_________________
YODA
2nd Degree Black Belt : Doce Pares Eskrima www.docepares.co.uk
Qualified Instructor : JKD Concepts www.jkdc.co.uk
Qualified Fitness Instructor (Weights, CV, Circuit, Kinesiology) |
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Bon
Black Belt
Joined: 10 Aug 2001
Posts: 1047
Location: Australia
Styles: BJJ, Kickboxing
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| Posted: Mon May 06, 2002 2:11 am Post subject: |
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google of course..
you ?
_________________
It takes sacrifice to be the best.
There are always two choices, two paths to take. One is easy. And its only reward is that it's easy. |
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YODA
Black Belt
Joined: 25 Jan 2002
Posts: 1033
Location: England (int'north west)
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| Posted: Mon May 06, 2002 3:05 am Post subject: |
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Yep - Google. So it's how you're searching then.
_________________
YODA
2nd Degree Black Belt : Doce Pares Eskrima www.docepares.co.uk
Qualified Instructor : JKD Concepts www.jkdc.co.uk
Qualified Fitness Instructor (Weights, CV, Circuit, Kinesiology) |
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Bon
Black Belt
Joined: 10 Aug 2001
Posts: 1047
Location: Australia
Styles: BJJ, Kickboxing
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| Posted: Mon May 06, 2002 4:22 am Post subject: |
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I use AND, NOT, +, _ and all...
Ditto ;p
_________________
It takes sacrifice to be the best.
There are always two choices, two paths to take. One is easy. And its only reward is that it's easy. |
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van_damme
Orange Belt
Joined: 13 Mar 2002
Posts: 210
Location: London England
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| Posted: Mon May 06, 2002 7:48 am Post subject: |
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| I guess i was wrong...lolz |
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on the post.
