What evidence supports the idea that a collision between two spiral galaxies might lead to the formation of a single elliptical galaxy?
A) observations of giant elliptical galaxies at the center of dense clusters that may have grown by consuming other galaxies
B) observations of some elliptical galaxies surrounded by shells of stars that probably formed from stars stripped out of smaller galaxies
C) observations of some elliptical galaxies with stars and gas clouds in their cores that orbit differently from the other stars in the galaxy
D) the fact that elliptical galaxies dominate the galaxy populations at the cores of dense clusters of galaxies
E) all of the above
E
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When gravitational, magnetic and any forces other than static electric forces are not present, electric field lines in the space surrounding a charge distribution show
a. the directions of the forces that exist in space at all times. b. only the directions in which static charges would accelerate when at points on those lines c. only the directions in which moving charges would accelerate when at points on those lines. d. tangents to the directions in which either static or moving charges would accelerate when passing through points on those lines. e. the paths static or moving charges would take.
A mirror must be ________ in shape to reflect the light back to a focus
Fill in the blank(s) with correct word
An inventor wants you to finance construction of a machine that will run at room temperature by using the free thermal energy available in the air itself. Should you invest $100,000? Why or why not?
What will be an ideal response?
Convective heat transfer can only occur if fluids mediate the energy transfer
Indicate whether the statement is true or false