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

    12
    ReputationRep:
    In my physics test i had a question which i'm just not too sure about.

    There were two of the same balls shape and size, travelling through two different tubes containing one warm oil and one cold oil. The ball in the warm oil traveled faster than in the cold oil. By 40 cm the cold oil had reached terminal velocity, but the other ball was still accelerating

    The question asked whether the drag experienced by the ball in the warm oil was equal to, greater than or less than the drag experienced by the ball in the cold oil. I presumed that because it was travelling at a faster speed downwards through the liquid then it will have a greater drag? Or is the drag greater for the cold oil at 40 cm because it's at terminal velocity?

    Thanks in advance
    Offline

    10
    ReputationRep:
    (Original post by BDunlop)
    In my physics test i had a question which i'm just not too sure about.

    There were two of the same balls shape and size, travelling through two different tubes containing one warm oil and one cold oil. The ball in the warm oil traveled faster than in the cold oil. By 40 cm the cold oil had reached terminal velocity, but the other ball was still accelerating

    The question asked whether the drag experienced by the ball in the warm oil was equal to, greater than or less than the drag experienced by the ball in the cold oil. I presumed that because it was travelling at a faster speed downwards through the liquid then it will have a greater drag? Or is the drag greater for the cold oil at 40 cm because it's at terminal velocity?

    Thanks in advance
    less than because the time it took to reach 40 seconds for the oil was less so it accelerates faster and is travelling at a faster velocity.
    Offline

    15
    ReputationRep:
    I suggest you look at your drag/terminal velocity calculations.

    The balls are the same, but the oil is not. What properties will change by the oil being warmer and what effect will this have on the drag/terminal velocity inputs/equation?
    Offline

    13
    ReputationRep:
    the drag was less in the hot oil because it had a higher rate of acceleration because the oil was less dense
 
 
 
  • See more of what you like on The Student Room

    You can personalise what you see on TSR. Tell us a little about yourself to get started.

  • Poll
    Brexit voters: Do you stand by your vote?
  • See more of what you like on The Student Room

    You can personalise what you see on TSR. Tell us a little about yourself to get started.

  • 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.