The _________of a polymer is the combination of irradiation with light, including UV, and the reaction with atoms and molecules in the environment such as oxygen, nitrogen, and water.
Fill in the blank(s) with the appropriate word(s).
weathering
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One of the intriguing questions for scientists of many ages has been "What are the elementary particles?" Which of the following is not considered an elementary particle?
A. Electron B. Quark C. Proton D. Muon
A point charge Q is placed on the x axis at the origin. An identical point charge is placed on the x axis at x = -1.0 m and another at x = +1.0 m. If Q = 40 mC, what is the magnitude of the electrostatic force on the charge at x = +1.0 m?
a. 29 N b. 14 N c. 11 N d. 18 N e. 7.0 N
How was Edwin Hubble able to use his discovery of a Cepheid in Andromeda to prove that the "spiral nebulae" were actually entire galaxies?
A) There are no Cepheids in the Milky Way, so his discovery proved that it had to be in another galaxy. B) He measured the stellar parallax of the Cepheid in Andromeda, was able to determine the distance to it, and showed that it was far outside the Milky Way Galaxy. C) From the period-luminosity relation for Cepheids, he was able to determine the distance to Andromeda and show that it was far outside the Milky Way Galaxy. D) Since a Cepheid is a type of luminous galaxy, when he found it in Andromeda he was able to prove that Andromeda was a separate galaxy from the Milky Way.
When you touch a cold piece of ice with your finger, energy flows
A) from your finger to the ice. B) from the ice to your finger. C) actually, both ways.