What are two ways engineer's use their understanding of KE and PE to make their designs better/safer?

The branch of science which deals with chemicals is called chemistry.

The energy formed in a system by the motion of particles is called kinetic energy. which is half of the product of the mass and volume.

The energy stored in the system when it's at a rest is called potential energy, the energy is converted into kinetic energy when it starts moving. The potential energy is stated as the product of the mass, height, and acceleration due to gravity.

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Explained below.

Explanation:

When someone is riding on an amusement ride also known as a roller coaster, due to the nature of the turns and slope, energy will change from potential to kinetic energy and it will be repeated a couple of times throughout the the course of the ride.

Now, Kinetic energy is the one that is used during motion.

Normally, the amusement ride vehicles will be pulled up from the first hill by a chain and as the other vehicles follow that route in climbing, and they will then gain potential energy.

assuming that your periodic table has eighteen columns, you should highlight   the four elements in the third column from the left of the table.

neutral atoms of elements after calcium contain d electrons. the energy of d orbitals of a particular main shell lies between the energy of the s and p orbitals of the next main shell. for example, electrons in the have energy higher than those in the orbital while lower than those of the orbital.

by the aufbau principle, electrons fill orbitals one at a time, starting from those of the lowest energy. the orbital is therefore filled right after orbitals and before orbitals.  

potassium has electron configuration and calcium . the s orbital of a main shell holds a maximum of two electrons. the next element would thus have the electron configuration and satisfy the requirements.

a neutral atom of the element contains three electrons on top of the most recent noble gas element. it should thus be placed in the third column of the periodic table. both scandium and yttrium would satisfy the conditions. an aufbau diagram indicates that the 4f orbital is filled before the 5d. however, it appears that exceptions exists for both lanthanum and actinium. neutral atoms of the two d-block elements also demonstrate the and should be highlighted as well.

if you're asking what comes out, it's steam.