Final answer:
To calculate the force exerted by air pushing upward on a roof due to a pressure difference, the pressure difference and the area affected are required. Given only the average atmospheric pressure and the area, we cannot provide an exact answer without knowing the internal pressure or the specific pressure difference.
Step-by-step explanation:
To find the force exerted by the air inside a building that pushes the roof upwards due to a difference in pressure, we use the formula F = P × A, where F is the force in Newtons (N), P is the pressure difference in pascals (Pa), and A is the area in square meters (m²).
In this case, the problem doesn't directly provide the pressure difference ('P'), but we know that atmospheric pressure at sea level averages 1.01 × 10⁵ Pa. Assuming this is the outside pressure and knowing that the force exerted is due to a difference in pressure, we need to know the inside pressure to calculate the difference. However, since the options provided are forces (N), and we are missing the critical data about internal pressure, we cannot ascertain a precise answer.
Without the internal pressure value or the specific pressure difference value, we are unable to provide a conclusive answer. You may need to verify the question and ensure all necessary information is included for an accurate calculation.