Did you know that ultrasonic sound can serve as a cleanser? When ultrasonic sound passes through water, the sound waves cause the water to vibrate rapidly. Ultrasonic washing machines use this principle to shake dirt loose from clothing placed in the water. The same motion is
used for cleaning small metal parts. These are placed in a cleaning fluid agitated by vibrating quartz. The action shakes the dirt and grease off the
metal quickly.
Ultrasonic sound is also used to remove smoke from the air. Standing waves are produced in the air by means of reflectors. The resulting
vibrations make the small particles of soot in the air move toward the nodes of the waves. These particles collide and stick to each other. They form
larger particles which keep growing until they are heavy enough to fall to the ground,
When the soot particles collide, how are they moving?
1. toward the sound wave nodes
2around the reflectors
3. past the vibrating quartz
4 through cleaning fluid

1. read the following excerpt from franklin d. roosevelt's "fireside chat 19":

on the other side of the picture, we must learn also to know that guerilla warfare against the germans in, let us say serbia or norway, us; that a successful russian offensive against the germans us; and that british successes on land or sea in any part of the world strengthen our hands.

remember always that germany and italy, regardless of any formal declaration of war, consider themselves at war with the united states at this moment just as much as they consider themselves at war with britain or russia. and germany puts all the other republics of the americas into the same category of enemies. the people of our sister republics of this hemisphere can be honored by that fact.  

the true goal we seek is far above and beyond the ugly field of battle. when we resort to force, as now we must, we are determined that this force shall be directed toward ultimate good as well as against immediate evil. we americans are not destroyers — we are builders.

analyze the effectiveness of this excerpt. how does it function within the speech as a whole? how does the structure of the excerpt to convey the speech's purpose and key points? support your argument with evidence from the speech. (10 points)

on apex:

removing american indians from the south is for their own good.

the correct answer is option d. none of these. it is noted that options a, b, and c share the same content.

despite the valid answer provided at the last sentence of each of the options, a question/answer format shouldn't include humourous themed responses such as "you bet your thermal pj's we do." - unless of course, the answer is carried out in an informal environment. this could be replaced with a simple "yes" or "it is necessary".

the question should be re-phrased to a more appropiate syntaxis. instead of "do we need the greenhouse effect? ", it should be written as "is the greenhouse effect necessary? " in order to give it a general scope, instead of limiting the answer to the needs of "we" the humans.