Please solve question 5.
Dear student,
(A) The important factor here is density of both the spheres.
Since sphere A is made of wood, whose density is less than that of water, it will float.
Since sphere B is made of iron, whose density is much greater than water, it will sink.
Volume of sphere A = 100cm3
Density of wood = 0.3g/cm3
Therefore, mass = density * volume = 0.3*100 = 30g
Therefore,weight of sphere A = 30gf
For sphere A to float, by law of floatation,
weight = upthrust
Therefore,
Upthrust = 30gf
Volume of sphere B = 100cm3
Upthrust = Volume of water displaced * density of water * g
= 100cm3 * 1g/cm3 * g
= 100gf
Therefore,
Upthrust on sphere A = 30gf
Upthrust on sphere B = 100gf
(b) Sphere A will float because of the density of wood is lesser than the density of water.
Regards.