Question

i) The mass of a iron piece is 50 g. A measuring cylinder contains water to a level of 15 mL. The water level rises to 20 mL mark when the iron piece is dipped in it. Find the density of iron.
ii)"It is easier to swim in sea water than in river water”. Explain.​

Answer 1

Answer:

volume of the iron peace is the volume of the water displaced so water displaced is 5ml

therefore

so,

density d=volume displaced by water v

d=v

v=5ml

Explanation:

it is easy to swim in the sea water as it is a much more denser because of the salt dissolves in it which gives more boyancy

Answer 2

P=m/v
P=density
M=mass
V=volume

P of iron cube = 50/5 = 5

Answer to ii = Buoyancy – saltwater gives more buoyancy than freshwater because of the higher density of saltwater.