Which of the following explains why more aluminum drink cans are recycled than plastic bottles? A. Aluminum is better for closed-loop recycling.
B. Plastics can only be down-cycled.
C. Aluminum is more energy efficient to recycle.
D. Plastics are not included in single-stream recycling.
(THE SUBJECT IS "SCIENCE AND MATHEMATICS IN THE REAL WORLD") I cannot find an answer anywhere else.

For the closed feedwater heater below, feedwater enters state 3 at a pressure of 2000 psia and temperature of 420 °f at a rate of ix10 ibhr. the feedwat extracted steam enters state 1 at a pressure of 1000 psia and enthalpy of 1500 btu/lbm. the extracted er leaves at an enthalpy of 528.7 btu/lbm steam leaves as a saturated liquid. (16) a) determine the mass flow rate of the extraction steam used to heat the feedwater (10) b) determine the terminal temperature difference of the closed feedwater heater

The thermal expansion or contraction of a given metal is a function of the f a)-density b)-initial temperature c)- temperature difference d)- linear coefficient of thermal expansion e)- final temperature f)- original length

Journeyman training is usually related (clo2) a)-to specific tasks b)-to cost analysis of maintenance task c)-to control process to ensure quality d)-to installation of machinery