Suppose you live at latitude 30°S. Which star is circumpolar in your sky?
A) Alpha Centauri
B) Deneb
C) Spica
D) Sirius
A
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What is an accretion disk?
A) a disk of hot gas swirling rapidly around a white dwarf, neutron star, or black hole B) any flattened disk in space, such as the disk of the Milky Way Galaxy C) a stream of gas flowing from one star to its binary companion star D) a disk of material found around every white dwarf in the Milky Way Galaxy
Graphical Analysis: If the velocity versus time graph of an object is a horizontal line, the object is
A. moving with zero acceleration. B. moving with constant non-zero acceleration. C. at rest. D. moving with increasing speed.
A boy on a bicycle rides in a circle of radius 
at speed 
If the boy rides at a radius equal to half the radius 
by what factor must he change his speed in order to have the same centripetal acceleration?
A. 0.25 B. 2 C. 0.71 D. 4 E. 1.4 F. 0.5
Process of Science: Make a prediction from the theory of plate tectonics and then look to see if you can find an example on Earth that provides a test
What will be an ideal response?