AlgebraEasy–MediumMeaning of the constant in a pressure model
Algebra practice question
The pressure p, in kilopascals, at a depth of d metres in a lake is modelled by p = 100 + 9.8d. What does the number 100 represent in this model?
- A. The pressure at the surface of the lakeCorrect
- B. The increase in pressure for each metre of depth
- C. The depth at which the pressure is zero
- D. The maximum pressure in the lake
Answer: A. The pressure at the surface of the lake
At d = 0 the pressure is 100.
Why the other answers are wrong
- B. The increase in pressure for each metre of depth
- The increase per metre is 9.8.
- C. The depth at which the pressure is zero
- The pressure is never zero in this model.
- D. The maximum pressure in the lake
- Pressure keeps increasing with depth.
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