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HELP with Physics Questions Needed!

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  • 28-02-2015 3:36pm
    #1
    ABCE
    Registered Users Posts: 36 ✭


    Just stumbled across these 2 questions while revising Pressure,Gravity & Moments.

    1) The height of a mercury column in a mercury barometer is .75cm. Given that the density of Mercury is 1.36 x 10^4 kg m^-3, find the pressure of the atmosphere on that day.

    2) A layer of silver 0.02mm thick is deposited by eloctrolysis onto a spoon of total surface area 20cm^2.
    Calculate the volume of silver used. Calculate the mass of silver used(Density of silver=1.05 x 10^4 kg m^-3)

    Any help with these question would be appreciated.
    Thanks in advance.


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    #2
    Frigating
    Registered Users Posts: 249 ✭✭Frigating


    1) Pressure = density x gravity x height

    2) Volume = length x width x height


  • Options
    #3
    ABCE
    Registered Users Posts: 36 ✭ABCE


    Thanks a lot! I didn't know there was a formula for Pressure other than P=F/A

    For the 2nd one, which is which? They only give 2 figures so how do I get the third from that?


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    #4
    Frigating
    Registered Users Posts: 249 ✭✭Frigating


    The surface area is l x w, just multiply the two you're given together


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    #5
    ABCE
    Registered Users Posts: 36 ✭ABCE


    Lol,feeling stupid now..
    Anyway,thanks for the help!!


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    #6
    Frigating
    Registered Users Posts: 249 ✭✭Frigating


    No prob, let me know if you need any more help


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