At t = 0, a particle leaves the origin with a velocity of 12 m/s in the positive x direction and moves in the xy plane with a constant acceleration of 
m/s2. At the instant the y coordinate of the particle is 18 m, what is the x coordinate of the particle?
A. 30 m
B. 21 m
C. 27 m
D. 24 m
E. 45 m
Answer: C
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Briefly describe how a star forms
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The existence of the world's subtropical deserts (such as the Sahara) is primarily due to
A) warm ocean currents. B) strong prevailing northwesterly winds. C) extremely high temperatures. D) belts of atmospheric high pressure.
A 10-meter-long spear is thrown at relativistic speeds through a 10-meter-long pipe. (Both these dimensions are measured when each is at rest.) When the spear passes through the pipe
A) the spear appears to shrink so the pipe completely covers it. B) the pipe appears to shrink so the spear extends from both ends. C) both appear to shrink equally so the pipe barely covers the spear. D) any of these, depending on the motion of the observer (moving with the spear, at rest with the pipe, and so on). E) none of the above