The largest difference between Mars' northern and southern hemispheres is that:
A) the southern appears older, with more impact craters.
B) the northern has all the outflows and must have been much hotter.
C) the northern is higher overall, despite some high volcanoes in the south.
D) the southern has a polar cap, but none ever forms in the north.
E) the southern is much darker, with large mare-like basaltic lava flows.
A
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William Herschel discovered the green disk of ________ as the first telescopic planet
Fill in the blank(s) with correct word
In a perfectly ELASTIC collision between two perfectly rigid objects
A) the momentum of each object is conserved. B) the kinetic energy of each object is conserved. C) the momentum of the system is conserved but the kinetic energy of the system is not conserved. D) both the momentum and the kinetic energy of the system are conserved. E) the kinetic energy of the system is conserved, but the momentum of the system is not conserved.
An example of a heat mover is a(n)
a. refrigerator b. air conditioner c. heat pump d. all of the above e. none of the above
The energy from the accretion disk around a black hole would show gravitational red shift due to its immense gravity and tidal distortion of space there
Indicate whether the statement is true or false