What is proper motion? How is it related to transverse velocity?
What will be an ideal response?
Annual apparent motion of a star across the sky, in arc seconds per year. If we also know the star's distance, this angular motion can be turned into the transverse velocity in km/sec.
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The work performed as a function of time for a process is given by W = at3, where a = 2.4 J/s3. What is the instantaneous power output at t = 3.7 s?
A) 99 W B) 69 W C) 139 W D) 208 W
A circus performer stretches a tightrope between two towers. He strikes one end of the rope and sends a wave along it toward the other tower. He notes that it takes 0.8 s for the wave to travel the 20 m to the opposite tower. If one meter of the rope has a mass of 0.35 kg, find the tension in the tightrope
Bones show up in x ray images because they absorb x rays more efficiently than muscle and other tissues do
Indicate whether the statement is true or false
Based on the number of galaxies visible in the Hubble eXtreme Deep Field (Figure 20.1 in your text), the estimated number of galaxies in our observable universe is at least
A) 100 billion. B) 100 million. C) 50,000. D) infinity.