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
Answer This Question
Related Questions
 fluid mechanics  A brick weighs 15.0 N and is resting on the ground. Its ...
 physics  A brick weight 17.8N and is resting on the ground. Its dimensions are ...
 general physics  A solid concrete block weighs 160 N and is resting on the ...
 Physics  Four bricks are to be stacked at the edge of a table, each brick ...
 Physics  A builder wants to build a corbeled arch, based on the principle of ...
 math  bricks are stacked in 20 rows such that each row has a fixed number of ...
 maths  A brick wall is built by using 2 bricks less in each layer than in the ...
 Physics  A typical brick has dimensions of 20.0 cm by 10.0 cm by 5.0 cm and ...
 physics  there are 1000 bricks and when they are stacked neatly they measure 2m...
 physics  the mass of a brick is 2.5 kg. its dimensions are 10cmx5cmx2cm. find ...
More Related Questions