Basic answering process of junior high school physics calculation questions

Basic answering process of junior high school physics calculation questions

Then write the formula, such as s = vt
The next step is the write operation process, such as s = 5m, s.5s = 25m
Finally, the answer
In case of acceleration, the positive direction should be explained

On April 2, 2010, Denmark's national treasure bronze sculpture "Little Mermaid" arrived in Shanghai and became the treasure of the Danish Pavilion at the World Expo. The height of the statue is 1.5 meters, and the diameter of the cornerstone is 1.8 meters, The tin density is 5.8g/cm3) the result is taken as an integer (2) if the mermaid bronze statue is cast from the bronze with the above composition, and the bronze statue is made according to the volume ratio of 1:1 for people of the same height, and it is known that the weight of a 1.5m middle school student is 40kg, what is the weight of the mermaid statue?

1. The density of bronze is: ρ o = m / v = (3 + 1) Mo / (V1 + V2) = 4mo / (3Mo / ρ 1 + Mo / ρ 2) = 4 ρ 1 ρ 2 / (ρ 1 + 3 ρ 2) = 4x8.9g/cm & sup3; x5.8g/cm & sup3; / (8.9g / cm & sup3; + 3x5.8g / cm & sup3;) = 7.85g/cm & sup3; = = = [8g / cm & sup3;]. 2. From ρ = m / V, v = m / ρ is obtained