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

    0
    ReputationRep:
    stuck on a physics question, help me please.

    "two of the wires used on a violin are made of steel, the two wires (labeled A & G) are both 500mm long between the pegs and support. the 500mm length of wire labelled G has a mass of 2.0 \times 10^{-3}kg. The density of steel is 7.8 \times 10^{3}kg m^{-3}.

    1, show that the corss-sectional are of the wire G is 5.1 \times 10^{-7}m^{2}."
    Offline

    2
    ReputationRep:
    (Original post by KeineHeldenMehr)
    stuck on a physics question, help me please.

    "two of the wires used on a violin are made of steel, the two wires (labeled A & G) are both 500mm long between the pegs and support. the 500mm length of wire labelled G has a mass of 2.0 \times 10^{-3}kg. The density of steel is 7.8 \times 10^{3}kg m^{-3}.

    1, show that the corss-sectional are of the wire G is 5.1 \times 10^{-7}m^{2}."
    density = \rho
    \rho = \frac{m}{v}

    with some simple rearranging we can get

    v= \frac{m}{\rho}

    where volume of a string = length times cross section area (C)

    so we get

    500E-3 \times C = \frac{2E-3}{7.8E3}

    which should give you the correct answer!
    • Thread Starter
    Offline

    0
    ReputationRep:
    (Original post by Chaoslord)
    density = \rho
    \rho = \frac{m}{v}

    with some simple rearranging we can get

    v= \frac{m}{\rho}

    where volume of a string = length times cross section area (C)

    so we get

    500E-3 \times C = \frac{2E-3}{7.8E3}

    which should give you the correct answer!
    what is E?
    Offline

    2
    ReputationRep:
    (Original post by KeineHeldenMehr)
    what is E?
    short hand or x10

    so 500E-3 means 500 x 10^-3
    • Thread Starter
    Offline

    0
    ReputationRep:
    (Original post by Chaoslord)
    short hand or x10

    so 500E-3 means 500 x 10^-3
    eh. - not use to informal short hand,
    ok, thanks.
    Offline

    2
    ReputationRep:
    (Original post by KeineHeldenMehr)
    eh. - not use to informal short hand,
    ok, thanks.
    ... its the short hand used by calculators which arent that new =P
    • Thread Starter
    Offline

    0
    ReputationRep:
    (Original post by Chaoslord)
    ... its the short hand used by calculators which arent that new =P
    oh, i get you,
    the EXP button? (underneath pi on my calc)

    what calculator?
    casio with no natural display?

    SVPAM
    fx-85WA?

    new models are

    fx-83ES.
    Offline

    0
    ReputationRep:
    (Original post by Chaoslord)
    ... its the short hand used by calculators which arent that new =P
    This isn't a calculator.
    Offline

    2
    ReputationRep:
    (Original post by KeineHeldenMehr)
    oh, i get you,
    the EXP button? (underneath pi on my calc)

    what calculator?
    casio with no natural display?

    SVPAM
    fx-85WA?

    new models are

    fx-83ES.
    thats the one

    oh and D-Day i was being lazy D:

    dont judge me
    Offline

    0
    ReputationRep:
    i was simply pointing out the pitfalls associated with using shorthand notation out-of-place and assuming others know what you're saying.
 
 
 
  • 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
    Would you like to hibernate through the winter months?
  • 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

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