Two plastics that are targeted for recycling from household waste are polyethylene terephthalate (pete) and high density polyethylene (hdpe). one of the problems of recycling such materials is separating them. suppose you have been hired to set up a process for separating large quantities of waste plastic that is a mixture of pete and hdpe. describe how you might perform this separation.

The separation can easily be carried out on the basis of the difference in densities of polyehtylene terephthalate (PETE) and high density polyethylene (HDPE). To do this, we may grind the polymers into chips and then begin vibrating the mixture of the plastics. The more dense HDPE chips will settle to the bottom and the less dense PETE chips will remain at the upper portion.

Mass is the amount of matter in an object.  weight is the measurement of the pull of gravity on an object.  say for example, you travel to the moon which has a different gravitational field compared to the gravitational field of earth. (gravitational fields: earth = 1, moon = 0.165)  now when you are on the moon, the pull of gravity on you is different than on the earth. and as weight is the measurement of the pull of gravity on an object, that means yes, your weight can and will change on the moon.  however, on the moon, on earth or even on jupiter, the amount of mass inside of you remains the same. meaning your physical mass remains constant.  in conclusion it is possible for your weight to change as your mass remains constant.