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    Physics Q

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    Ahmed
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    Physics Q

    Post by Ahmed on 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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    Re: Physics Q

    Post by Justice on 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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    Re: Physics Q

    Post by Ahmed on Sun Jun 20, 2010 8:57 pm

    I thought it was sin the angle since we need the y-component?


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    Re: Physics Q

    Post by Justice on Sun Jun 20, 2010 9:00 pm

    horizontal is the x you frooblet


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    Re: Physics Q

    Post by Ahmed on Sun Jun 20, 2010 9:04 pm

    I know you noob. We want the VERTICAL.


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    Re: Physics Q

    Post by Justice on 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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    Re: Physics Q

    Post by Ahmed on 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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    Re: Physics Q

    Post by Justice on Sun Jun 20, 2010 9:17 pm

    UT is wrong then what number did you get?


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    Re: Physics Q

    Post by Ahmed on 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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    Re: Physics Q

    Post by Justice on Sun Jun 20, 2010 9:32 pm

    UT is wrong then you frooblet


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    Re: Physics Q

    Post by Ahmed on 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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    Re: Physics Q

    Post by The Banker on 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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    Re: Physics Q

    Post by Ahmed on Mon Jun 21, 2010 11:17 am

    You don't need to lol. I already solved it.


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    Re: Physics Q

    Post by Fangy on 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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    Re: Physics Q

    Post by Fangy on 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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    Re: Physics Q

    Post by Fangy on Mon Jun 21, 2010 11:50 am

    Owait you solved it.
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    Re: Physics Q

    Post by Ahmed on Mon Jun 21, 2010 11:51 am

    This is physics.

    And I already solved it up there ^^^


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    Re: Physics Q

    Post by Fangy on 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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    Re: Physics Q

    Post by Ahmed on Mon Jun 21, 2010 11:57 am

    Well I got the right answer by doing that.


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    Re: Physics Q

    Post by The Banker on Mon Jun 21, 2010 2:43 pm

    that makes life simpler >.>
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    Re: Physics Q

    Post by Ahmed on Mon Jun 21, 2010 9:22 pm

    Explain why the answer is 1J:

    The work done in lifting an apple one meter
    near Earths surface is approximately


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    Re: Physics Q

    Post by Justice on Mon Jun 21, 2010 10:32 pm

    cause u use mgh. 10*1*.1=1J (we did it class)


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    Re: Physics Q

    Post by Justice on Mon Jun 21, 2010 10:33 pm

    The other choices for the MC dont make sense too


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    Re: Physics Q

    Post by Ahmed on Mon Jun 21, 2010 10:37 pm

    But how do you know that the mass is 1kg?


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    Re: Physics Q

    Post by Justice on Tue Jun 22, 2010 5:37 pm

    The mass is .1
    10 m/s^2 *1 m *.1 KG = 1J


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