Answer: Pressure is force divided by area. In this case, the area is 2.1 cm x 2.1 cm
Explanation: Pressure is force divided by area. In this case, the area is 2.1 cm x 2.1 cm but since we want to calculate the pressure in Pascals, we will want to change to standard SI units of meters, so 0.021 cm x 0.021 cm or 0.000441 m2. The force though needs to be calculated from the mass of the material. In physics, you will learn that force equals mass times acceleration. The acceleration in this case is the acceleration of gravity which is 9.807 m/s2. The mass is 72.9 grams which can be converted to kg by dividing by 1000 so m = 72.9/1000 = 0.0729 kg.
So Pressure (in Pascals) = mg/A = (0.0729)(9.807)/(0.000441) = 1621 Pa. Using the appropriate number of significant figures, the Pressure = 1620 Pa
