Turn on thread page Beta

Edexel Jan 2002 Q7 help watch

Announcements
    • Thread Starter
    Offline

    0
    ReputationRep:
    Can someone please help me figure out how the hell to do this question. I can't for the life of me figure it out.

    Thanks
    Chris
    Offline

    0
    ReputationRep:
    Pure? Stats? Mechanics? Decision?
    • Thread Starter
    Offline

    0
    ReputationRep:
    OH god I'm sorry. It's Mech. My brain is fried:P
    Offline

    18
    ReputationRep:
    You are in luck, I have this paper on my desk!

    7)a
    Resolve forces vertically
    R - 2.5(3/5) - 0.3g = 0
    R = 4.44N

    Resolve horizontally -->
    2.5(4/5) - Friction = 0
    F = 2.5(4/5) = 2N

    F = mu*R
    2 = 4.44mu
    mu = 2/4.44 = 0.450

    Values in bold are from using pythagoras.

    7)b
    Resolve forces vertically
    R + 2.5(3/5) - 0.3g = 0
    R = 0.3g - 1.5 = 1.44N

    7)c
    F = mu*R
    Reaction has decreased therefore friction has decreased. Coefficient of friction remains the same.
    Horizontal component of tension is unchanged.
    Therefore no longer in equilibrium.
    • Thread Starter
    Offline

    0
    ReputationRep:
    Thanks a million!!! I had my diagram all wrong. The resultant force was parallel to the string :|. Thanks again!
 
 
 
Turn on thread page Beta
Updated: January 11, 2005

University open days

  • University of East Anglia
    All Departments Open 13:00-17:00. Find out more about our diverse range of subject areas and career progression in the Arts & Humanities, Social Sciences, Medicine & Health Sciences, and the Sciences. Postgraduate
    Wed, 30 Jan '19
  • Aston University
    Postgraduate Open Day Postgraduate
    Wed, 30 Jan '19
  • Solent University
    Careers in maritime Undergraduate
    Sat, 2 Feb '19
Poll
Brexit: Given the chance now, would you vote leave or remain?
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

Equations

Best calculators for A level Maths

Tips on which model to get

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.