When the displacement of a mass on a spring is 12 A, what percentage of the energy is kinetic energy? At what displacement, as a fraction of A, is the energy half kinetic and half potential?

75%

Explanation:

x = Displacement of spring =

k = Spring constant

Total energy of the spring is

Elastic potential energy is given by

Total energy is given by

The percentage will be

The required percentage is 75%

According to the given condition

So, the energy is half when displacement is

answer;

d. are made mostly of liquid

explanation;

-the general   composition and structure planets includes; they have a thick gas and liquid layer covering a small,solid core. mostly the gases are hydrogen and helium atmosphere and layers of liquid hydrogen. for instance neptune and uranus are examples of the outer planets, they have a core covered by ice and ammonia.

-neptune's atmosphere is hydrogen and helium with a bit of methane so there is no oxygen to breath and the interior is made up of frozen water and ammonia with a rock and iron core. thus, there is no liquid water or solid surface to survive.

the answer is f1 and d2 because if you put equal force on those two points the beam would balance trust me on this