This photo shows a radio telescope that is being used in the search for life beyond Earth. How is it being used in this search?
A) It is used to listen for signals deliberately broadcast by another civilization.
B) It is used to obtain spectra of planets around other stars so that we can look for chemicals, like oxygen, that might indicate the presence of life.
C) It is used to make detailed radar maps of Mars, from which we may be able to determine whether cities ever existed on our planetary neighbor.
D) It is used to communicate with spacecraft that we have launched toward distance stars in search of life on planets that my orbit them.
A) It is used to listen for signals deliberately broadcast by another civilization.
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Estimate the maximum cooling rate for a jominy bar at a jominy distance of 15 cm and when does it occur?
FIG 3-23
Jominy end-quench test
Should we expect to find abundant amounts of gold and other rare-earth elements elsewhere in the universe?
What will be an ideal response?
A 1.2-kg mass is projected up a rough circular track (radius = 0.80 m) as shown. The speed of the mass at point A is 8.4 m/s, and at point B, it is 5.6 m/s. What is the change in mechanical energy between A and B caused by the force of friction?
a.
?2.7 J
b.
?8.8 J
c.
?4.7 J
d.
?6.7 J
e.
?19 J
A new generation of ground-based telescopes is currently being built that overcomes the limitations of the older large telescopes. Some of these new telescopes
a. use segmented mirrors. b. use mirrors that are very thin. c. use active optics to control the shape of the mirror. d. all of the above. e. none of the above