The density of human body is similar to that of water. The mass of a middle school student is about 50kg, and its volume is______ M3, the gravity is______  N．

The density of human body is similar to that of water. The mass of a middle school student is about 50kg, and its volume is______ M3, the gravity is______  N．

It is known that: M = 50kg, ρ = 1.0 × 103kg / m3, g = 9.8n/kg. Calculate: Volume V and gravity g of middle school students. According to ρ = MV, we can get: Volume V = m, ρ = 50kg, 1.0 × 103kg / m3 = 0.05m3 of middle school students; gravity g = mg = 50kg × 9.8n/kg = 490N

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