The position of a particle moving along the x axis is given by x = (21 + 22t ? 6.0t2) m, where t is in s. What is the average velocity during the time interval t = 1.0 s to t = 3.0 s?
a. ?6.0 m/s
b. ?4.0 m/s
c. ?2.0 m/s
d. ?8.0 m/s
e. 8.0 m/s
c
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Entropy: When 0.50 kg of water at 0°C freezes, what is the change in entropy of the water? The latent heat of fusion of water is 33,400 J/kg.
A. 0 J/K B. 610 J/K C. -610 J/K D. -17,000 J/K E. 17,000 J/K
Thin Films: When a beam of light, originally traveling in air, enters a piece of glass having an index of refraction of 3/2, its wavelength
A. increases by a factor of 3/2. B. is reduced to 2/3 its original value. C. is unaffected.
Shake an object to and fro if you want to judge its
A) mass. B) weight. C) both the same D) none of the above
Why do O stars exhibit weak hydrogen absorption lines?
A) At these high temperatures, nearly all the hydrogen is ionized, and is therefore unable to interact with light. B) O stars are too cool to excite hydrogen atoms to the first energy level from which they can then absorb visible wavelengths of light. C) O stars contain very little hydrogen.