Imagine that the apparent weight of the crown in water is wapparent=4.50n, and the actual weight is wactual=5.00n. is the crown made of pure (100%) gold? the density of water is rhow=1.00 grams per cubic centimeter. the density of gold is rhog=19.32 grams per cubic centimeter.

Explanation:

Actual weight, Wo = 5 N

Apparent weight, W = 4.5 N

density of water = 1 g/cm^3 = 1000 kg/m^3

density of gold, = 19.32 g/cm^3 = 19.32 x 1000 kg/m^3

Buoyant force = Actual weight - Apparent weight

Volume x density of water x g = 5 - 4.5

V x 1000 x 9.8 = 0.5

V = 5.1 x 10^-6 m^3

Weight of gold = Volume of gold x density of gold x gravity

W' = 5.1 x 10^-6 x 19.32 x 1000 x 9.8 = 0.966 N

As W' is less than W so, it is not pure gold.

f=ma newton

f=100x2.5=250n

heats surface water up