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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Why do O stars exhibit weak hydrogen absorption lines?
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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
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