The rotation curve of the galaxy provides evidence for the existence of the ____________________ which extends beyond the halo of the galaxy
Fill in the blank(s) with correct word
galactic corona
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A star can remain in the giant-star stage for about 90 percent of its total lifetime before it dies
Indicate whether the statement is true or false
On a hot summer day, the temperature is 40.0°C and the pressure is 1.01 × 105 Pa
Let us model the air as all nitrogen of molecular mass 28.0 g/mol having molecules of diameter 0.500 nm that are moving at their root-mean-square speed. Avogadro's number is 6.02 × 1023 molecules/mol, the ideal gas constant is 8.31 J/mol ? K, and the Boltzmann constant is 1.38 × 10-23 J/K. Calculate reasonable estimates for (a) the root-mean-square speed of the nitrogen molecules. (b) the average distance a typical molecule travels between collisions. (c) the average time a molecule travels between collisions, assuming that the molecules are moving at their root-mean-square speeds. (d) the number of collisions an average molecule undergoes per second. What will be an ideal response?
The empty space surrounding text and images is called ______ space.
A. blank B. white C. void D. focal
Two forces produce equal torques on a door about the door hinge. The first force is exerted at the midpoint of the door; the second force is applied at the doorknob. Both forces are exerted perpendicular to the door
Which force has a greater magnitude? A) the first force (at the midpoint) B) the second force (at the doorknob) C) The two forces are equal.