If the tensile strength of the kevlar 49 fibers is 0.550 x 10^6 psi
and that of the epoxy resin is 7 x 10^3 psi,
calculate the strength of a fiber epoxy composite material
that contains 60 percent by volume of kevlar 49 fibers
if the composite is stressed under isostress conditions.

When a comet collides with earth, it adds material to our planet and causes great damage. therefore, a collision like this is a a. destructive force b. constructive force c. geologic process and event d. constructive and destructive force

Predict the products butane (c4h10) + oxygen —>

Silver tarnishes as silver metal reacts with hydrogen sulfide, h2s, in the air. in this reaction, dark silver sulfide, au2s, covers the surface of silver. when silver is polished, this coating of silver sulfide can be removed from the surface. this makes the silver shiny again. enter the coefficients that balance the tarnishing reaction equation. (type 1 for no coefficient.)