December 21, 2024, 08:43:21 AM
Forum Rules: Read This Before Posting


« previous next »
Pages: [1]   Go Down

Topic: Calculating Pressure Exerted on a Surface  (Read 22454 times)

0 Members and 1 Guest are viewing this topic.

Offline laxplayer

  • Regular Member
  • ***
  • Posts: 45
  • Mole Snacks: +2/-1
  • Gender: Female
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  :]
Logged

Offline Mitch

  • General Chemist
  • Administrator
  • Sr. Member
  • *
  • Posts: 5298
  • Mole Snacks: +376/-3
  • Gender: Male
  • "I bring you peace." -Mr. Burns
    • Chemistry Blog
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 »
Logged
Most Common Suggestions I Make on the Forums.
1. Start by writing a balanced chemical equation.
2. Don't confuse thermodynamic stability with chemical reactivity.
3. Forum Supports LaTex

Offline laxplayer

  • Regular Member
  • ***
  • Posts: 45
  • Mole Snacks: +2/-1
  • Gender: Female
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?
Logged

Offline Mitch

  • General Chemist
  • Administrator
  • Sr. Member
  • *
  • Posts: 5298
  • Mole Snacks: +376/-3
  • Gender: Male
  • "I bring you peace." -Mr. Burns
    • Chemistry Blog
Re: Calculating Pressure Exerted on a Surface
« Reply #3 on: November 01, 2007, 06:24:33 PM »
Logged
Most Common Suggestions I Make on the Forums.
1. Start by writing a balanced chemical equation.
2. Don't confuse thermodynamic stability with chemical reactivity.
3. Forum Supports LaTex

Offline Borek

  • Mr. pH
  • Administrator
  • Deity Member
  • *
  • Posts: 27885
  • Mole Snacks: +1815/-412
  • Gender: Male
  • I am known to be occasionally wrong.
    • Chembuddy
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).
Logged
ChemBuddy chemical calculators - stoichiometry, pH, concentration, buffer preparation, titrations.info

Offline Padfoot

  • Full Member
  • ****
  • Posts: 221
  • Mole Snacks: +23/-2
Re: Calculating Pressure Exerted on a Surface
« Reply #5 on: November 01, 2007, 07:38:44 PM »
Quote from: Mitch on November 01, 2007, 05:53:44 PM
Pressure = Force x Area.
Pressure= Force/Area

Logged
Pages: [1]   Go Up
« previous next »
Sponsored Links