2. A block of wood of volume 80 cm and density 0.5g/cm3 floats in
water. What is the volume immersed in the water if d = 1 g/cm ?
3... .Pomilind ofdoneitsi
water

Volume = 40 cm³

Explanation:

Density = Mass/ Volume(1)

If Density = 0.5 g/cm³

and Volume = 80 cm³

Substituting these values into equation (1) to get the mass

0.5 = Mass/80

Mass = 0.5 * 80

Mass = 40 g

Now if density = 1 g/cm³

The mass of the wood remains constant, therefore, Mass = 40 g

Again to get the volume put the values for mass and volume into equation (1)

1 = 40/volume

Volume = 40/1

Volume = 40 cm³

b) phosphorus pentoxide

answer: 2×10^-2kg

explanation: density= mass per volume

vol=mass/density

converting to s.i units we have;

3÷1000kg = 0.003

1.5÷100m = 0.15

0.003/0.15 = 0.02kg