It’s assumed that a graphite-epoxy reinforced plastic with longitudinal fibers contains 25% graphite fibers (i. e. volume or area fraction). the elastic modulus of the fibers is 400gpa, and that of the epoxy matrix is 150 gpa. (a) calculate the elastic modulus of the composite and fraction of the load supported by the fibers. (b) calculate also the stresses in the fibers and in the matrix if the cross-sectional area and load of the composite are ac = 0.3 in2 and pc = 600 lb.

the current is 0.6

voltage ÷ resistance = current

so 12 ÷ 20 = 0.6

d₁ = displacement of tern from arctic to antarctic = 11000 miles

d₂ = displacement of tern from antarctic to arctic =   - 11000 miles

d = total displacement for the journey

total displacement for the journey is given as

d = d₁ + d₂

d = 11000 + (-11000)

d = 0 miles

t₁ = time of travel from arctic to antarctic = 3 months = 3 x 30 days = 90 days

t₂ = time of travel from antarctic to arctic = 3 months = 3 x 30 days = 90 days

t = total time of travel

total time of travel is given as

t = t₁ + t₂

t = 90 + 90

t = 180 days

average velocity is given as

average velocity = total displacement/ total time

v = d/t

v = 0/180

v = 0 miles/day