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mass & density

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 2.0×10−32.0 \times 10^{-3}kg. The density of steel is 7.8×1037.8 \times 10^{3}kg m−3m^{-3}.

1, show that the corss-sectional are of the wire G is 5.1×10−75.1 \times 10^{-7}m2m^{2}."
Reply 1
Avatar for Chaoslord
Chaoslord
16
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 2.0×10−32.0 \times 10^{-3}kg. The density of steel is 7.8×1037.8 \times 10^{3}kg m−3m^{-3}.

1, show that the corss-sectional are of the wire G is 5.1×10−75.1 \times 10^{-7}m2m^{2}."


density =ρ= \rho
ρ=mv\rho = \frac{m}{v}

with some simple rearranging we can get

v=mρv= \frac{m}{\rho}

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

so we get

500E−3×C=2E−37.8E3500E-3 \times C = \frac{2E-3}{7.8E3}

which should give you the correct answer!
Chaoslord
density =ρ= \rho
ρ=mv\rho = \frac{m}{v}

with some simple rearranging we can get

v=mρv= \frac{m}{\rho}

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

so we get

500E−3×C=2E−37.8E3500E-3 \times C = \frac{2E-3}{7.8E3}

which should give you the correct answer!


what is E?
Reply 3
Avatar for Chaoslord
Chaoslord
16
KeineHeldenMehr
what is E?


short hand or x10

so 500E-3 means 500 x 10^-3
Chaoslord
short hand or x10

so 500E-3 means 500 x 10^-3


eh. - not use to informal short hand,
ok, thanks.
Reply 5
Avatar for Chaoslord
Chaoslord
16
KeineHeldenMehr
eh. - not use to informal short hand,
ok, thanks.


... its the short hand used by calculators which arent that new =P
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.
Reply 7
Avatar for D-Day
D-Day
10
Chaoslord
... its the short hand used by calculators which arent that new =P


This isn't a calculator.
Reply 8
Avatar for Chaoslord
Chaoslord
16
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
Reply 9
Avatar for D-Day
D-Day
10
i was simply pointing out the pitfalls associated with using shorthand notation out-of-place and assuming others know what you're saying.

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