Turn on thread page Beta

M1 Qu. watch

Announcements
    • Thread Starter
    Offline

    0
    ReputationRep:
    A cyclist and her bicycle have a combined mass of 78kg. While riding on level ground and using her greatest driving force, she is able to accelerate uniformly from rest to 10ms^-1 in 15 seconds against constant resistive forces that total 60N. Her maximum driving force is 112N.

    The cyclist begings to ascend a hill, inclined at an angle x to the horizontal, riding with her maximum driving force and against the same resistive forces. In this case, she is able to maintain a steady speed.

    1. Find the angle x, giving your answer to the nearest degree.

    _____________
    I got as far as, 60 = 60 sin x. ButI think I'm wrong.

    Anyone help?

    Cheers
    • Thread Starter
    Offline

    0
    ReputationRep:
    2. A large block of mass 50kg is being pulled on rough horizontal ground by means of a rope attached to the block. The tension in the rope is 200N and it makes an angle of 30 degrees with the horizontal. The coefficient of friction between the block and the ground is 0.424.

    Ignoring air resistance, find the acceleration of the block.
    Attached Files
  1. File Type: doc Doc12.doc (19.0 KB, 70 views)
    Offline

    2
    ReputationRep:
    (Original post by adk)
    2. A large block of mass 50kg is being pulled on rough horizontal ground by means of a rope attached to the block. The tension in the rope is 200N and it makes an angle of 30 degrees with the horizontal. The coefficient of friction between the block and the ground is 0.424.

    Ignoring air resistance, find the acceleration of the block.


    R+ 200sin30=50x9.8
    R=390N

    Fric=coef of frict x R
    Fric= 0.424x390=165.4N

    Force= mass x acceleartion
    200-165.39 = 50 x acc
    a=0.69m/s^2
    • Thread Starter
    Offline

    0
    ReputationRep:
    (Original post by tammypotato)
    Force= mass x acceleartion
    200-165.39 = 50 x acc
    a=0.69m/s^2
    Is it not '200 cos 30' there, instead of just '200'?
    Offline

    10
    ReputationRep:
    (Original post by adk)
    Is it not '200 cos 30' there, instead of just '200'?
    Yeah, it should be 200cos 30.
    Offline

    2
    ReputationRep:
    (Original post by adk)
    Is it not '200 cos 30' there, instead of just '200'?
    yeah sorry 200cos30-165.36=50 a
    a=0.157ms^-2
 
 
 

University open days

  1. Norwich University of the Arts
    Undergraduate Open Days Undergraduate
    Fri, 28 Sep '18
  2. Edge Hill University
    Faculty of Health and Social Care Undergraduate
    Sat, 29 Sep '18
  3. Birmingham City University
    General Open Day Undergraduate
    Sat, 29 Sep '18
Poll
Which accompaniment is best?

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.