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### Topic: Calculating Pressure Exerted on a Surface  (Read 22354 times)

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#### laxplayer

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##### Calculating Pressure Exerted on a Surface
« on: November 01, 2007, 05:48:20 PM »
The problem says this: A lead cube with edges 11.0 cm in length rests on a flat surface. The density of lead is 11.34 g/cm3. Calculate the pressure in pascals exerted by the cube on the surface.

Basically I have no idea what to do. I know there are 101,325 Pa in 1 atm, and I calculated the mass to be 15,093.54 g, but I don't know if that pertains.

Could someone tell me how to work this problem out, don't give the answer though, thanks  :]

#### Mitch

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##### Re: Calculating Pressure Exerted on a Surface
« Reply #1 on: November 01, 2007, 05:53:44 PM »
Pressure = Force / Area. You'll need to calculate the force of gravity of the object exerting onto the surface. Force = mass x Earth's gravitational constant.
« Last Edit: November 02, 2007, 01:49:07 PM by Mitch »
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#### laxplayer

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##### Re: Calculating Pressure Exerted on a Surface
« Reply #2 on: November 01, 2007, 05:56:05 PM »
how do I know what the gravitational constant is?

#### Mitch

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##### Re: Calculating Pressure Exerted on a Surface
« Reply #3 on: November 01, 2007, 06:24:33 PM »
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#### Borek

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##### Re: Calculating Pressure Exerted on a Surface
« Reply #4 on: November 01, 2007, 07:22:52 PM »
I can be wrong, as English nomenclature is not my forte, but gravitational constant seems to be 6.67x10-11 Nm2/kg2. 9.82 m/s2 is standard gravity (called Earth's accelaration in Polish).
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