To penetrate armor, a projectile's point concentrates force in a small area, creating a stress large enough that the armor fails. a species of jellyfish launches a pointed needle that can penetrate the hard shell of a crustacean. the rapid deceleration on impact creates a 32 μn force on the tip, which has a very small 15 nm radius.

4.527×10^{10} N/m^2

Explanation:

Assuming that the resulting stress is asked in the question in N/m^2

The stress is given by the expression

σ = F/A

F= 32μN  and A, Area= πr^2

r,  radius = 15 nm

Putting values we get

= 4.527×10^{10} N/m^2

hence the resulting stress is  4.527×10^{10} N/m^2

they are non-matter

explanation:

they are non-matter. basically, any type of energy or any abstract concept is an example of something that does not matter. other examples include dreams, magnetism, radio, and hate

adding a(n) to an electric circuit would increase the magnetic field around a wire;

b. solenoid

a solenoid is a type of electromagnet whose purpose is to generate a controlled magnetic field.

if the purpose of the solenoid is instead to impede changes in the electric current, a solenoid can be more specifically classified as an inductor rather than an electromagnet.