What measurements are needed to determine the orbital motion of a spectroscopic binary star?
What will be an ideal response?
Measure the spectra of the binary system over time and determine the Doppler shifts of the spectral lines from each star.
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Newton concluded that some force must act on the Moon because ____
a. a force is needed to pull the Moon away from straight-line motion b. a force is needed to pull the Moon outward c. a force is needed to keep the Moon in motion d. the Moon has at a constant velocity e. the Moon has a constant acceleration
Mort observes Velma's light-clock, as Velma passes. Mort thus observes Velma's clock to be
A) slow. B) on time. C) stopped. D) fast. E) moving backward in time.
_________corrosion is the dissolution of a metal that occurs when it is electrically connected to a more noble metal in an electrolyte.
Fill in the blank(s) with the appropriate word(s).
A 2.5-kg object falls vertically downward in a viscous medium at a constant speed of 2.5 m/s. How much work is done by the force the viscous medium exerts on the object as it falls 80 cm?
a. +2.0 J b. +20 J c. ?2.0 J d. ?20 J e. +40 J