Question

4
Four hollow glass spheres P, Q, R and S each have a mass of 729.
Their volumes are given in the table.
volume/cm
P
55
Q
65
R
75
S
85

Which spheres sink in a liquid of density 0.9 g/cm3

Answer 1

Answer:

All four glass spheres will sink in the liquid.

Explanation:

the glass spheres which will have more density compared to the liquid will sink. The density of the liquid is 0.9 g/cm³. now the density of the glass spheres are:

density = mass/volume

P = 729 / 55 = 13.5 g/cm³

Q = 729 / 65 = 11.215 g/cm³

R = 729 / 75 = 9.72 g/cm³

S = 729 / 85 = 8.58 g/cm³