Final answer:
The question inquires about calculating the mass using given density per unit area and total area. By multiplying the density (2.5 kg/m²) by the area (100 m²), we find that the mass is 250 kg, which is choice (a).
Step-by-step explanation:
The provided question appears to be related to the concept of density from Physics, with an emphasis on calculating mass when given density (represented by sigma, σ) and area. Assuming that the symbol σ stands for the density per unit area (which seems to be the case, given the data provided and the similarity to challenge problem 81), the mass can be found by multiplying the density per square meter by the total area in square meters.
- First, identify the density per square meter: σ = 2.5 kg/m²
- Then, multiply this density by the given area to find the mass: mass = density × area
- Calculate the mass: 2.5 kg/m² × 100 m² = 250 kg
The correct choice, given these calculations, is (a) 250 kg.