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 ...
- math - bricks are stacked in 20 rows such that each row has a fixed number of ...
- physics - there are 1000 bricks and when they are stacked neatly they measure 2m...
- Physics - A builder wants to build a corbeled arch, based on the principle of ...
- maths - A brick wall is built by using 2 bricks less in each layer than in the ...
- physics - the mass of a brick is 2.5 kg. its dimensions are 10cmx5cmx2cm. find ...
- Physics - A typical brick has dimensions of 20.0 cm by 10.0 cm by 5.0 cm and ...

More Related Questions