Two vectors starting at the same origin have equal and opposite x components. Is it possible for the two vectors to be perpendicular to each other? Justify your answer.
What will be an ideal response?
Yes. If the y components are of the right magnitudes, the angle can be 90 degrees. (This will occur if 
and A = B tan ?1.)
and A = B tan ?1.)
Physics & Space Science
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A 10-kg rock and 20-kg rock are dropped from the same height and experience no significant air resistance. If it takes the 20-kg rock a time T to reach the ground, what time will it take the 10-kg rock to reach the ground?
A) 4T B) T/2 C) T D) 2T E) T/4
Physics & Space Science
Pencil "lead" (graphite) is made primarily of
a. oil. b. PbO2. c. carbon. d. Pb.
Physics & Space Science
Simple Pendulum: A ball swinging at the end of a massless string, as shown in the figure, undergoes simple harmonic motion. At what point (or points) is the magnitude of the instantaneous acceleration of the ball the greatest?
A. C B. A and D C. A and C D. A and B E. B
Physics & Space Science
According to today's classification system, how many major planets are there in the solar system?
a. 10
b. 9
c. 8
d. 11
Physics & Space Science