Seasonal variations on Mars are due
A) only to its changing distance from the Sun
B) only to its axis tilt
C) to changes in the amounts of energy emitted by the Sun
D) both to its axis tilt and its changing distance from the Sun
D
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What law explains why a rotating, collapsing cloud forms a flat protostellar disk around a protostar?
A) Kepler's third law B) the universal law of gravitation C) Wien's law D) conservation of angular momentum
A child is standing at the rim of a freely rotating disk holding a rock. The disk rotates without friction. The rock is dropped at the instant shown. Which of the following statements is true about the process of dropping the rock?
The point P lies along the perpendicular bisector of the line connecting two long straight wires S and T perpendicular to the page. A set of directions A through H is shown next to the diagram. When the two equal currents in the wires are directed up out of the page, the direction of the magnetic field at P is closest to the direction of
a.
E.
b.
F.
c.
G.
d.
H.
e.
A.
Which method of extrasolar planet detection is able to measure the compositions of extrasolar planet atmopsheres?
A) gravitational lensing B) Doppler technique C) transit technique D) astrometric technique