Results are out! Find what you need...fast. Get quick advice or join the chat
Hey! Sign in to get help with your study questionsNew here? Join for free to post

M1 Projectiles

Announcements Posted on
Don't forget to check out our results day hub. See you on the day for celebration and support, good luck! 22-06-2015
Will you get the grades you need for uni? Get prepared today and de-stress, sign up to email alerts for course places! 02-06-2015
  1. Offline

    ReputationRep:
    If I don't get part A correct, I'm screwed for the rest of the questions.

    Is it tan inverse 6/8 ?? ie 36.9 degrees? (3SF)

    Click image for larger version. 

Name:	IMG-20120506-00122.jpg 
Views:	43 
Size:	347.5 KB 
ID:	146081
  2. Online

    ReputationRep:
    Where do you get the 8 from? Use toa.
  3. Offline

    ReputationRep:
    (Original post by Hopple)
    Where do you get the 8 from? Use toa.
    So its tan inverse 6/10?

    IDK but I put the velocity of 8 as part of the triangle then assumed 10 must have been the hyptonuse, so i thought 8 was the adjacent :|
  4. Online

    ReputationRep:
    (Original post by MSI_10)
    So its tan inverse 6/10?
    Yeah, that's it.
  5. Offline

    ReputationRep:
    yes tanα is 6/10
  6. Offline

    ReputationRep:
    (Original post by Hopple)
    Yeah, that's it.
    Aight thanks.

    Am I starting part b probably; to get time, first need to use S. Do I use 6 or 10..?

    Then SUVAT (S=ut+o.5at^2) use quadratic formula to get t?
  7. Online

    ReputationRep:
    (Original post by MSI_10)
    Aight thanks.

    Am I starting part b probably; to get time, first need to use S. Do I use 6 or 10..?

    Then SUVAT (S=ut+o.5at^2) use quadratic formula to get t?
    For part b, are you looking at vertical or horizontal motion (or both)? And yes, that suvat equation will do.
  8. Offline

    ReputationRep:
    (Original post by Hopple)
    For part b, are you looking at vertical or horizontal motion (or both)? And yes, that suvat equation will do.
    I did this..
    S=-6
    a=-9.8
    U=8sin31..

    -6=8sin31t-4.9t^2
    -4.9^2+8sin31t+6=0
    got t=1.60 or t=-0.763

    Answer t=1.60..?
  9. Online

    ReputationRep:
    (Original post by MSI_10)
    I did this..
    S=-6
    a=-9.8
    U=8sin31..

    -6=8sin31t-4.9t^2
    -4.9^2+8sin31t+6=0
    got t=1.60 or t=-0.763

    Answer t=1.60..?
    Make sure you're measuring everything in the same direction.
  10. Offline

    ReputationRep:
    (Original post by Hopple)
    Make sure you're measuring everything in the same direction.
    :\
  11. Online

    ReputationRep:
    (Original post by MSI_10)
    :\
    Even though everything's going downwards, you've made displacement and acceleration be in the opposite direction to initial velocity.
  12. Offline

    ReputationRep:
    (Original post by Hopple)
    Even though everything's going downwards, you've made displacement and acceleration be in the opposite direction to initial velocity.
    Oh that's what you meant, yeah i get what you mean now thanks

    So t=0.763
  13. Offline

    ReputationRep:
    Hmm, can anyone check if im doing part c correctly.

    It's asking for distance.. do I use the time obtained from part b, use S=ut+1/2at^2 but use 8cos31 for u instead of 8sin31..?
  14. Offline

    ReputationRep:
    (Original post by MSI_10)
    Hmm, can anyone check if im doing part c correctly.

    It's asking for distance.. do I use the time obtained from part b, use S=ut+1/2at^2 but use 8cos31 for u instead of 8sin31..?
    Yes, but remember there are no forces acting horizontally here.
  15. Offline

    ReputationRep:
    (Original post by finality)
    Yes, but remember there are no forces acting horizontally here.

    Alright so I used 8sin31
    I get the answer as 6m. Something tell's me this aint right; it seems to high :\

Reply

Submit reply

Register

Thanks for posting! You just need to create an account in order to submit the post
  1. this can't be left blank
    that username has been taken, please choose another Forgotten your password?
  2. this can't be left blank
    this email is already registered. Forgotten your password?
  3. this can't be left blank

    6 characters or longer with both numbers and letters is safer

  4. this can't be left empty
    your full birthday is required
  1. By joining you agree to our Ts and Cs, privacy policy and site rules

  2. Slide to join now Processing…

Updated: May 6, 2012

How high will tuition fees go?

Students share their thoughts on possible increases

Study resources
Article updates
x

Think you'll be in clearing or adjustment?

Hear direct from unis that want to talk to you

Get email alerts for university course places that match your subjects and grades. Just let us know what you're studying.

Quick reply
Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.