A long thin sample of a substance is easily bent. When the substance is placed in a n electric circuit and the switch is closed, and LED light turns on. What type of bonding holds the particles of the substance together?

An engineer decides to use a slightly weaker material rather than a stronger material, since she knows that the stronger material can break suddenly. this is an example of what? a choosing a material that will show warning before it fails b using composite materials that combine strength c using a material for multiple applications d using design techniques that increase efficiency and reduce cost