A handicraft made of gold and silver has a measured volume of 20 cubic centimetres and a mass of 280 grams. If we replace it with an aluminum handicraft with a density of 2.7 g / cubic centimeter How many grams of weight can be reduced

A handicraft made of gold and silver has a measured volume of 20 cubic centimetres and a mass of 280 grams. If we replace it with an aluminum handicraft with a density of 2.7 g / cubic centimeter How many grams of weight can be reduced

1. Using aluminum to make 20cm3 needs weight = 20 * 2.7 = 54G
2. Mass reduction = 280-54 = 226 G

A handicraft made of gold and copper has a mass of 600g and a volume of 50cm3 (ρ - gold = 19.3 × 103kg / m3, ρ - Copper = 8.9 × 103kg / m3). If the total volume of the handicraft remains unchanged, the gold content of the handicraft is______ g．

Suppose that the mass of gold in handicraft is m gold, and the mass of copper is m copper; ρ gold = 19.3 × 103kg / m3 = 19.3g/cm3, ρ copper = 8.9 × 103kg / m3 = 8.9g/cm3; from the Title Meaning: m gold + m copper = 600g -------- V gold + V copper = 50cm3, that is, m gold ρ gold + m copper ρ copper = 50cm3; m gold 19.3g/cm3 + m copper 8.9g/c

The shot put used in PE class has a mass of 4kg and a volume of about 0.57dm3. Is it made of pure lead?

Given that M = 4kg, v = 0.57dm3 = 5.7 × 10-4m3, then the density of shot is ρ = MV = 4kg, 5.7 × 10 − 4m3 = 7 × 103kg / m3. Looking up the density table, we can see that the density of lead is 11.3 × 103kg / m3, so this kind of shot is not made of pure lead