Homework Help: Physics

Posted by AL on Sunday, November 25, 2007 at 3:42pm.

A brick weighs 15.0 N and is resting on the ground. Its dimensions are 0.203 m 0.0890 m 0.0570 m. A number of the bricks are then stacked on top of this one. What is the smallest number of whole bricks (including the one on the ground) that could be used, so that their weight creates a pressure of at least one atmosphere on the ground beneath the first brick? (Hint: First decide which face of the brick is in contact with the ground.)

pressure = force / area
density = Mass / volume
1atm = 101300 Pa

Physics - bobpursley, Sunday, November 25, 2007 at 4:14pm
pressure= total weight/area

I will be happy to critique your thinking.
Physics - AL, Sunday, November 25, 2007 at 4:16pm
well what i did was i found the area of the face to be .203 * .0890..then i divided 15/ Area to get pressure then i did 101300 / pressure to get number of bricks..this doesnt work
Physics - bobpursley, Sunday, November 25, 2007 at 4:28pm
smallest number of bricks will mean the greatest pressure, or smallest area. The side of the brick giving the smallest area will be .0890 x .0570, wouldn't it? The weight on that face gives the greatest pressure.
Physics - AL, Sunday, November 25, 2007 at 4:38pm
oo ok cool thanks

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