2 (a) Describe, in terms of particles, two differences between a solid and a liquid of the same substance - Edexcel - GCSE Physics Combined Science - Question 2 - 2021 - Paper 1

To find the mass of the concrete block, we first need to calculate its volume.

Using the dimensions given in Figure 3:

• Length = 1.5 m
• Width = 1.0 m
• Height = 0.20 m

The volume (V) can be calculated as:

$V = ext{Length} imes ext{Width} imes ext{Height}$

Substituting the values:

$V = 1.5 imes 1.0 imes 0.20 = 0.3 ext{ m}^3$

Now, we can use the density (ρ) of concrete to find the mass (m):

$m = ρ imes V$

Substituting the values:

$m = 2100 ext{ kg/m}^3 imes 0.3 ext{ m}^3 = 630 ext{ kg}$

Thus, the mass of the concrete block is 630 kg.

1. Insulating the walls and roof to minimize heat transfer.

2. Installing double-glazed windows to reduce heat loss through glass.

To convert from Celsius to Kelvin, we use the formula:

$K = °C + 273.15$

Substituting the given temperature:

$K = -4 + 273.15 = 269.15 ext{ K}$

Therefore, the temperature on the Kelvin scale is 269.15 K.