How did Harlow Shapley use the period-luminosity relationship of RR Lyrae variables to determine the size of the Milky Way galaxy?
a. He determined the proper motion of globular clusters in the outer disk of the galaxy.
b. He found the distances to individual variables free floating in the halo.
c. He found the distances to open clusters found throughout the disk of the galaxy.
d. He found the distances to globular clusters distributed about the center of the galaxy.
d
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A ten billion year old globular cluster has every star evolved into a giant, with no main sequence stars left
Indicate whether the statement is true or false
Carbon-14, compared to Carbon-12,
A. has more protons B. has more neutrons C. has more electrons D. has a shorter half-life
Fluid Flow: A pump uses a piston of 15 cm diameter that moves at 2.0 cm/s as it pushes a fluid through a pipe. What is the speed of the fluid when it enters a portion of the pipe that is 3.0 mm in diameter? Treat the fluid as ideal and incompressible.
A. 50 m/s B. 50 cm/s C. 6.0 cm/s D. 22 cm/s
Mafic definition
What will be an ideal response?