Hey there! Sign in to join this conversationNew here? Join for free
    • Thread Starter
    Offline

    1
    ReputationRep:
    Name:  image.jpg
Views: 56
Size:  501.7 KBAlready got part a) but can't do anything about part b)...I'm sure that the b)i) will lead me to solve the questions afterwards, however I don't know how to find the max speed Need help pleaseeee
    Offline

    22
    ReputationRep:
    (Original post by Oliviazh)
    Name:  image.jpg
Views: 56
Size:  501.7 KBAlready got part a) but can't do anything about part b)...I'm sure that the b)i) will lead me to solve the questions afterwards, however I don't know how to find the max speed Need help pleaseeee
    Part (b) is basically part (a) except with u = 2, \ell = 5, \alpha = 30^{\circ}

    So \displaystyle v^2 = 4 + 10g\left(\cos \theta - \frac{\sqrt{3}}{2}\right) - you now need to maximise this expression.
    Offline

    22
    ReputationRep:
    (Original post by Zacken)
    Part (b) is basically part (a) except with u = 2, \ell = 5, \alpha = 30^{\circ}

    So \displaystyle v^2 = 4 + 10g\left(\cos \theta - \frac{\sqrt{3}}{2}\right) - you now need to maximise this expression.
    Hint: this is maximised when \cos \theta - \frac{\sqrt{3}}{2} is maximised.

    Hint 2: The above expression is maximised when \cos \theta is maximised.

    Hint 3: The maximum value of \cos \theta is 1.
    • Thread Starter
    Offline

    1
    ReputationRep:
    (Original post by Zacken)
    Hint: this is maximised when \cos \theta - \frac{\sqrt{3}}{2} is maximised.

    Hint 2: The above expression is maximised when \cos \theta is maximised.

    Hint 3: The maximum value of \cos \theta is 1.
    Oh How stupid I am! Thanks a lot
    Offline

    22
    ReputationRep:
    (Original post by Oliviazh)
    Oh How stupid I am! Thanks a lot
    No worries.
 
 
 
Poll
Do you agree with the PM's proposal to cut tuition fees for some courses?
Useful resources

Make your revision easier

Maths

Maths Forum posting guidelines

Not sure where to post? Read the updated guidelines here

Equations

How to use LaTex

Writing equations the easy way

Student revising

Study habits of A* students

Top tips from students who have already aced their exams

Study Planner

Create your own Study Planner

Never miss a deadline again

Polling station sign

Thinking about a maths degree?

Chat with other maths applicants

Can you help? Study help unanswered threads

Groups associated with this forum:

View associated groups

The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE

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