It is not necessary to separate metals from paper in the feedstock for a MSW energy plant
What will be an ideal response?
While it is possible to include metals in the feedstock for a MSW trash-to-energy
plant, it is simpler to remove them. The "heavy metals" in the trash cause significant
disposal problems—this makes the slag be classified as hazardous waste—and it is much
better if all metals are removed before incineration.
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If two stars are stacked vertically on a H-R diagram then they necessarily differ in their
A. luminosity class. B. spectral class. C. distance. D. temperature.
Pressure in a Liquid: A cubical block of stone is lowered at a steady rate into the ocean by a crane, always keeping the top and bottom faces horizontal. Which one of the following graphs best describes the gauge pressure p on the bottom of this block as a function of time t if the block just enters the water at time t = 0 s?
A. 
B. 
C. 
D. 
E. 
A student has to work the following problem: A block is being pulled along at constant speed on a horizontal surface a distance d by a rope supplying a force F at an angle of elevation q. The surface has a frictional force acting during this motion. How much work was done by friction during this motion? The student calculates the value to be –Fdsinq. How does this value compare to the correct
value? a. It is the correct value. b. It is too high. c. It is too low. d. The answer cannot be found until it is known whether q is greater than, less than, or equal to 45°.
In a visual binary system with circular orbits, if in 20 years the two stars' position angles have shifted by 30 degrees, the pair's period must be
A) 60 years. B) 90 years. C) 120 years. D) 240 years. E) 360 years.