Question

A piece of iron of density 7.8g/cm3 and volume 100 cm3 is fully immersed in water (density of water 1g/cm3). calculate 1. weight of iron piece in air 2. upthrust of water on iron piece 3. apparent wt. of iron piece in water (g= 10 m/s2)

Answer 1

1. weight of iron price in air= volume×density=7.8×100=
780grams
2. weight of object in air/weight of object in water=density of object/density of fluid