The amplitude of a lightly damped harmonic oscillator decreases from 60.0 cm to 40.0 cm in 10.0 s. What will be the amplitude of the harmonic oscillator after another 10.0 s passes?
A) 0.00 cm B) 30.0 cm C) 26.7 cm D) 20.0 cm E) 167 cm
C
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Entropy: On a cold winter day, the outside temperature is -20°C and the inside temperature is maintained at 20°C. There is a net heat flow to the outside through the walls, roof, etc., of 25 kW. What is the rate of increase of the entropy of the universe as a result of this heat flow?
A. 13 W/K B. 25 W/K C. 85 W/K D. 99 W/K E. 0 W/K
Atomic Nucleus: An yttrium isotope has 39 protons and 50 neutrons in its nucleus. Which one of the following symbols accurately represents this isotope?
A. 
Y
B. 
Y
C. 
Y
D. 
Y
E. 
Y
In 1869, a major event in the history of chemistry occurred; it was the
a. discovery of the law of definite proportions. b. discovery of the octet rule. c. discovery of the law of conservation of mass. d. development of the periodic table.
Thermosetting polymers are more brittle than thermoplastic polymers, because the long-chain molecules are _____________.
Fill in the blank(s) with the appropriate word(s).