| Physics Q | |
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Ahmed NH Admin
Number of posts : 51452 Username Change Points : 61089 Reputation : 147 Registration date : 2007-10-14 Mood : Country :
| Subject: Physics Q Sat Jun 19, 2010 5:22 pm | |
| A Knight of the Round Table fires off a vat of burning pitch from his catapult at 14.3 m/s, at 37 ◦ above the horizontal. The acceleration of gravity is 9.8 m/s2 . How long is it in the air? Answer in units of s. | |
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Justice NH Member
Number of posts : 741 Username Change Points : 6401 Reputation : 5 Registration date : 2010-04-29 Mood : Country :
| Subject: Re: Physics Q Sun Jun 20, 2010 8:50 pm | |
| Ahmed your gona fail the physics regents.
2*14.3 * cos 37 / 9.81
Punch in the number in your calc you frooblet. | |
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Ahmed NH Admin
Number of posts : 51452 Username Change Points : 61089 Reputation : 147 Registration date : 2007-10-14 Mood : Country :
| Subject: Re: Physics Q Sun Jun 20, 2010 8:57 pm | |
| I thought it was sin the angle since we need the y-component? | |
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Justice NH Member
Number of posts : 741 Username Change Points : 6401 Reputation : 5 Registration date : 2010-04-29 Mood : Country :
| Subject: Re: Physics Q Sun Jun 20, 2010 9:00 pm | |
| horizontal is the x you frooblet | |
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Ahmed NH Admin
Number of posts : 51452 Username Change Points : 61089 Reputation : 147 Registration date : 2007-10-14 Mood : Country :
| Subject: Re: Physics Q Sun Jun 20, 2010 9:04 pm | |
| I know you noob. We want the VERTICAL. | |
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Justice NH Member
Number of posts : 741 Username Change Points : 6401 Reputation : 5 Registration date : 2010-04-29 Mood : Country :
| Subject: Re: Physics Q Sun Jun 20, 2010 9:09 pm | |
| Allow me to explain this for Frooblets like Ahmed.If you want to know the time it took to go across you use cosine. | |
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Ahmed NH Admin
Number of posts : 51452 Username Change Points : 61089 Reputation : 147 Registration date : 2007-10-14 Mood : Country :
| Subject: Re: Physics Q Sun Jun 20, 2010 9:10 pm | |
| Well guess what noob Lev. I put it on UTexas and it said you are WRONG. | |
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Justice NH Member
Number of posts : 741 Username Change Points : 6401 Reputation : 5 Registration date : 2010-04-29 Mood : Country :
| Subject: Re: Physics Q Sun Jun 20, 2010 9:17 pm | |
| UT is wrong then what number did you get? | |
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Ahmed NH Admin
Number of posts : 51452 Username Change Points : 61089 Reputation : 147 Registration date : 2007-10-14 Mood : Country :
| Subject: Re: Physics Q Sun Jun 20, 2010 9:18 pm | |
| Wrong!
You are WRONG NOOB!!!
I then did 2*sin angle*velocity/9.8
And I got it correct NOOB! | |
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Justice NH Member
Number of posts : 741 Username Change Points : 6401 Reputation : 5 Registration date : 2010-04-29 Mood : Country :
| Subject: Re: Physics Q Sun Jun 20, 2010 9:32 pm | |
| UT is wrong then you frooblet | |
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Ahmed NH Admin
Number of posts : 51452 Username Change Points : 61089 Reputation : 147 Registration date : 2007-10-14 Mood : Country :
| Subject: Re: Physics Q Sun Jun 20, 2010 9:35 pm | |
| LOL, you are wrong. I already looked this question on google before asking. The two noobs also said sin but they ddn't say the x2 part.
You are going to fail Lev...so don't be surprised. | |
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The Banker NH Member
Number of posts : 15240 Username Change Points : 8501 Reputation : 24 Registration date : 2009-10-27 Mood : Country :
| Subject: Re: Physics Q Mon Jun 21, 2010 5:12 am | |
| i've given up on Physics a loooong time ago, but like i'll have a go at the Q later on today. | |
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Ahmed NH Admin
Number of posts : 51452 Username Change Points : 61089 Reputation : 147 Registration date : 2007-10-14 Mood : Country :
| Subject: Re: Physics Q Mon Jun 21, 2010 11:17 am | |
| You don't need to lol. I already solved it. | |
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Fangy NH Retired Moderator
Number of posts : 8314 Username Change Points : 14227 Reputation : 71 Registration date : 2009-03-23 Mood : Country :
| Subject: Re: Physics Q Mon Jun 21, 2010 11:45 am | |
| Oh my god! I know this 0_0 we did it in math class. | |
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Fangy NH Retired Moderator
Number of posts : 8314 Username Change Points : 14227 Reputation : 71 Registration date : 2009-03-23 Mood : Country :
| Subject: Re: Physics Q Mon Jun 21, 2010 11:50 am | |
| A Knight of the Round Table fires off a vat of burning pitch from his catapult at 14.3 m/s, at 37 ◦ above the horizontal. The acceleration of gravity is 9.8 m/s2 . How long is it in the air? Answer in units of s.
14.3*cos(37) = whatever, I don't have a calculator. I'll just call it x. Now you have the vertical velocity at the start. 14.3*sin(37) = something else. that's the horizontal velocity, and it never changes. This will be Y. First you have to get the time to the peak. Simply divide X by 9.8. You then have only the time from the peak to the ground left to figure out, but that requires a whole lot. Oh crap, I'm starting to forget this... | |
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Fangy NH Retired Moderator
Number of posts : 8314 Username Change Points : 14227 Reputation : 71 Registration date : 2009-03-23 Mood : Country :
| Subject: Re: Physics Q Mon Jun 21, 2010 11:50 am | |
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Ahmed NH Admin
Number of posts : 51452 Username Change Points : 61089 Reputation : 147 Registration date : 2007-10-14 Mood : Country :
| Subject: Re: Physics Q Mon Jun 21, 2010 11:51 am | |
| This is physics.
And I already solved it up there ^^^ | |
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Fangy NH Retired Moderator
Number of posts : 8314 Username Change Points : 14227 Reputation : 71 Registration date : 2009-03-23 Mood : Country :
| Subject: Re: Physics Q Mon Jun 21, 2010 11:52 am | |
| - Ahmed IV wrote:
- LOL, you are wrong. I already looked this question on google before asking. The two noobs also said sin but they ddn't say the x2 part.
You are going to fail Lev...so don't be surprised. You don't use a x2, and I'm sure of that. | |
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Ahmed NH Admin
Number of posts : 51452 Username Change Points : 61089 Reputation : 147 Registration date : 2007-10-14 Mood : Country :
| Subject: Re: Physics Q Mon Jun 21, 2010 11:57 am | |
| Well I got the right answer by doing that. | |
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The Banker NH Member
Number of posts : 15240 Username Change Points : 8501 Reputation : 24 Registration date : 2009-10-27 Mood : Country :
| Subject: Re: Physics Q Mon Jun 21, 2010 2:43 pm | |
| that makes life simpler >.> | |
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Ahmed NH Admin
Number of posts : 51452 Username Change Points : 61089 Reputation : 147 Registration date : 2007-10-14 Mood : Country :
| Subject: Re: Physics Q Mon Jun 21, 2010 9:22 pm | |
| Explain why the answer is 1J:
The work done in lifting an apple one meter near Earth’s surface is approximately | |
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Justice NH Member
Number of posts : 741 Username Change Points : 6401 Reputation : 5 Registration date : 2010-04-29 Mood : Country :
| Subject: Re: Physics Q Mon Jun 21, 2010 10:32 pm | |
| cause u use mgh. 10*1*.1=1J (we did it class) | |
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Justice NH Member
Number of posts : 741 Username Change Points : 6401 Reputation : 5 Registration date : 2010-04-29 Mood : Country :
| Subject: Re: Physics Q Mon Jun 21, 2010 10:33 pm | |
| The other choices for the MC dont make sense too | |
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Ahmed NH Admin
Number of posts : 51452 Username Change Points : 61089 Reputation : 147 Registration date : 2007-10-14 Mood : Country :
| Subject: Re: Physics Q Mon Jun 21, 2010 10:37 pm | |
| But how do you know that the mass is 1kg? | |
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Justice NH Member
Number of posts : 741 Username Change Points : 6401 Reputation : 5 Registration date : 2010-04-29 Mood : Country :
| Subject: Re: Physics Q Tue Jun 22, 2010 5:37 pm | |
| The mass is .1 10 m/s^2 *1 m *.1 KG = 1J | |
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