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Question:

why are cement mixers places on a flat board?

hi, this is my question:To prevent a cement mixer sinking into soft ground, the mixer is placed on a large flat board. Why does this prevent the mixer sinking?the answer will be one of these, which one is it?A The large area decreases the pressure on the ground.B The large area increases the pressure on the ground.C The large area decreases the weight on the ground. D The large area increases the weight on the ground.

Answer:

The answer is A
May 11, 2017
None of the above. The pressure and weight on the ground is greater with a board under the mixer. However, the board distributes the weight across a larger surface area thereby reducing the pressure at any given point.
May 11, 2017
A. But it should read; The large area decreases the UNIT pressure on the ground. (Go for the brownie points!)
May 11, 2017
the flat board distributes the weight over a larger area, so the pressure per square inch is reduced.
May 11, 2017

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