A body of mass 5.0 kg is suspended by a spring which stretches 10 cm when the mass is attached. It is then displaced downward an additional 5.0 cm and released. Its position as a function of time is approximately
a. y = ?0.10 sin 9.9t
b. y = 0.10 cos 9.9t
c. y = ?0.10 cos (9.9t + .1)
d. y = 0.10 sin (9.9t + 5)
e. y = ?0.05 cos 9.9t
e
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Stars on the main sequence with the greatest mass
a. are spectral type M stars. b. are spectral type O stars. c. are located at the bottom of the main sequence in the HR diagram. d. have masses very similar to the sun. e. both b and c
When light goes from one material into another material having a HIGHER index of refraction,
A) its speed, wavelength, and frequency all decrease. B) its speed and wavelength decrease, but its frequency stays the same. C) its speed decreases but its wavelength and frequency both increase. D) its speed decreases but its frequency and wavelength stay the same. E) its speed increases, its wavelength decreases, and its frequency stays the same.
Hydrogen lines are weak in M class stars because they have much less of it than do A class stars
Indicate whether the statement is true or false
If a piece of ribbon were tied to a stretched string carrying a transverse wave, how would the ribbon be observed to oscillate?
a. Perpendicular to the wave motion b. Parallel to the wave motion c. Neither (A) nor (B) d. Both (A) and (B)