A 6.0 m ✕ 12.0 m swimming pool slopes linearly from a 1.0 m depth at one end to a 3.0 m depth at the other. What is the mass of water in the pool?

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Determine the volume of the swimming pool by calculating the average depth. Since the pool slopes linearly, the average depth is the mean of the shallow and deep ends: \( \text{Average Depth} = \frac{1.0 \text{ m} + 3.0 \text{ m}}{2} \).

Calculate the total volume of the pool using the formula for the volume of a rectangular prism: \( \text{Volume} = \text{Length} \times \text{Width} \times \text{Average Depth} \). Here, \( \text{Length} = 12.0 \text{ m} \), \( \text{Width} = 6.0 \text{ m} \), and \( \text{Average Depth} \) is the value calculated in the previous step.

Recall that the density of water is approximately \( 1000 \text{ kg/m}^3 \). Use the relationship between mass, density, and volume: \( \text{Mass} = \text{Density} \times \text{Volume} \). Substitute the density of water and the volume of the pool into this formula.

Perform the multiplication to find the mass of the water in the pool. Ensure that the units are consistent throughout the calculation (e.g., meters for length, width, and depth, and kilograms for mass).

Express the final mass in kilograms (\( \text{kg} \)) and verify that the result is reasonable given the dimensions of the pool and the density of water.

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주요 개념

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Volume of a Trapezoidal Prism

The swimming pool can be modeled as a trapezoidal prism due to its sloping depth. The volume of such a prism is calculated using the formula V = A * h, where A is the area of the base and h is the height. In this case, the base area is a trapezoid formed by the varying depths, and the height is the length of the pool.

Density of Water

Density is a measure of mass per unit volume, commonly expressed in kg/m³. For water, the density is approximately 1000 kg/m³ at standard conditions. To find the mass of the water in the pool, the volume calculated from the trapezoidal prism must be multiplied by the density of water.

Integration of Depths

Since the pool has a linear slope, the average depth can be used to simplify calculations. The average depth is the mean of the two depths (1.0 m and 3.0 m), which is 2.0 m. This average depth can be multiplied by the area of the base to find the total volume, making it easier to compute the mass of water.