Why does the rotation of our galaxy suggest that it is more massive than previously thought?
What will be an ideal response?
The best observations of the rotation curve of the Milky Way show that orbital velocities in the outer disk are constant or even increasing with distance from the center of the galaxy. Those high orbital velocities indicate that the larger orbits enclose more mass and imply that our galaxy has much more mass than is contained within the radius of the Sun's orbit.
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At what speed is the relativistic momentum five times the value calculated classically?
A. 0.99 c B. 0.98 c C. 0.96 c D. 0.80 c E. 0.20 c
A one pound (lbm) square of butter, 2.5 in by 2.5 in by 5 in at 50ºF is placed in a freezer at 28ºF as shown in the figure. If h is 10 Btu/hr?ft^2? ºF, the thermal conductivity is 0.114 Btu/hr?ft?ºF, specific heat is 0.52 Btu/lbm?ºF, and density is 56 lbm/ft^3, determine the time for the center to reach 35ºF.
The ____________________ is a measure of how many times larger the angular size of an object appears through a telescope
Fill in the blank(s) with correct word
How do asteroids differ from comets?
A) Asteroids are rocky bodies and are denser than the comets, which are made of icy material.
B) Asteroids are rocky bodies and are less dense than the comets, which are made of icy material.
C) Asteroids are made of icy material and are denser than the comets, which are more rocky.
D) Asteroids are made of icy material and are less dense than the comets, which are rockier.
E) Asteroids and comets are both made of rocky and icy material, but asteroids are smaller in size than comets.