What do we mean by a protogalactic cloud?
A) a cloud of hydrogen and helium that contracts to become a galaxy
B) a term once used historically to refer to any galaxy
C) a cloud-like halo that surrounds the disks of spiral galaxies
D) a cloud of gas that was once a galaxy
A) a cloud of hydrogen and helium that contracts to become a galaxy
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The fact that large elliptical galaxies are much more common in the central regions of galaxy clusters than elsewhere in the universe suggests that
A) collisions play a role in the formation of large elliptical galaxies. B) spiral galaxies cannot form in galaxy clusters. C) elliptical galaxies are older than spiral galaxies. D) elliptical galaxies from the outer regions of clusters must migrate inward.
Superconducting transmission lines may revolutionize the energy distribution system
What will be an ideal response?
Kinetic Energy: A 1.0-kg object moving in a certain direction has a kinetic energy of 2.0 J. It hits a wall and comes back with half its original speed. What is the kinetic energy of this object at this point?
A. 2.0 J B. 1.0 J C. 0.50 J D. 0.25 J E. 4.0 J
As entropy in a system increases, energy within the system
A) becomes more ordered. B) becomes less ordered. C) reaches equilibrium. D) moves toward destruction.