Ablock of mass m=5.20\; \mathrm{kg}m=5.20kg is being suspended at rest by an extended spring of spring constant k=36.0\; \mathrm{n/m}k=36.0n/m and an external force f=20.0\; \mathrm{n}f=20.0n downward. the spring is attached to the ceiling and has an extended length of s=2.45\; \mathrm{m}s=2.45m. what is the relaxed length s_0s 0 of the spring?

x₀ = 1,894 m

Explanation:

For this exercise let's use Hooke's law

     F = - k Δx = - k ( –x₀)

Let's write this equation for the given conditions, the extended length of the spring is the final length (xf = 2.45 m), the sense of force always opposes displacement

With the force applied

         F = -k ( - x₀)

        ( - x₀) = - F / k

        x₀ =   + F / k

        x₀ = 2.45 + (-20.0) / 36.0

        x₀ = 2.45 - 0.556

        x₀ = 1,894 m

This is the so-called natural spring length

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

laticia draws the diagram below to show earth’s magnetic field.

answer

the arrows to the right of earth should point up.