Answer:
0.0126°C
Explanation:
Kinetic energy sustain by the block,K.E = 1/2× mass×velocity^2
K.E = 1/2 ×1.3×(4^2)
=1/2 × 1.3× 16 = 1.3 ×8 = 10.4J
The internal energy is 71% of kinetic energy is;
U= 71/100 × 10.4 = 7.38J
But U = m × C × ∆T
Where U is internal energy
m is the mass of iron
C is the heat capacity of iron
∆T is the temperature change
By make ∆T the subject of the formula we have
∆T=U/ m×C
=7.38/ 1.3×452= 0.0126°C
