What physical feature of Mars is atypical compared with the other terrestrial planets?
A) its size
B) its atmospheric content
C) its surface composition
D) its density
E) its rotation rate
Ans: D) its density
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Dark energy is speeding up the expansion of the Universe.
Answer the following statement true (T) or false (F)
The model of ________ used circular deferents and epicycles in a geocentric universe to explain planetary motions
A) Ptolemy B) Hipparchos C) Copernicus D) Aristarchus E) Pythagoras
Two parallel wires carry a current I in the same direction. Midway between these wires is a third wire, also parallel to the other two, which carries a current 0.5 I, but in the direction opposite from the first two wires. In which direction are the net forces on the outer wires?
a. Since the net forces are zero, there is no direction. b. Both forces are toward the center wire. c. Both forces are away from the center wire. d. Both forces on the two wires are in the same direction in space.
Explain why leaves and plants are the colors they are, not black or white
What will be an ideal response?