In [2]:

```
import math
# Variables
E_f = 69; #modulus of elasticity in GPa
V_f = 40./100; #Volume of glass fibres %
E_m = 3.4; #modulus (in GPa)
V_m = 60./100; #Volume of polyester remath.sin %
# Calculation
E_cl = E_m*V_m+E_f*V_f; #modulus of elasticity (in Gpa)
# Results
print 'Modulus of elasticity is %.0f Gpa'%(E_cl)
```

In [1]:

```
import math
# Variables
E_f = 69; #modulus of elasticity in GPa
V_f = 40./100; #Volume of glass fibres %
E_m = 3.4; #modulus (in GPa)
V_m = 60./100; #Volume of polyester remath.sin %
# Calculation
E_cl = E_m*E_f/(E_m*V_f+E_f*V_m); #modulus of elasticity when the stress is applied perpendicular to the direction of the fibre alignment(in Gpa)
# Results
print 'modulus of elasticity when the stress is applied perpendicular to the direction of the fibre alignment = %.1f Gpa'%E_cl
```