Exhibit 12-3
The graph below shows a plot of angular velocity in rad/s versus time in s from t = 0 s to t = 7 s.
?
?
Use this exhibit to answer the following question(s).
Refer to . The change in angular position, ??, during the 7-second period is
a.
21 rad, CW.
b.
21 rad, CCW.
c.
30 rad, CW.
d.
30 rad, CCW.
e.
39 rad, CCW.
d
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Carbon-13 is a radioactive isotope. About half of a sample decays in 6,000 years. After how long would only 1/8 of the original carbon 13 be left?
A. 30,000 years B. 18,000 years C. 24,000 years D. 12,000 years E. 6,000 years
The index of refraction of a certain glass is measured to be 1.5. What is the speed of light in that glass? (c = 3.0 × 108 m/s)
A) 1.0 × 108 m/s B) 2.0 × 108 m/s C) 3.0 × 108 m/s D) 4.0 × 108 m/s E) 5.0 × 108 m/s
Molar Specific Heats: For an ideal gas,
A. 
= 1 for all ideal gases.
B. 
< 1 for all monatomic and diatomic gases.
C. 
> 1 for all monatomic and diatomic gases.
D. 
< 1 only for a monatomic gas.
E. 
< 1 only for a diatomic gas.
When a solid melts,
A) the temperature of the substance increases. B) the temperature of the substance decreases. C) heat energy leaves the substance. D) heat energy enters the substance.