As a main sequence star evolves off the main sequence, the helium core is contracting while the outer envelope is _______________
Fill in the blank(s) with correct word
expanding
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Mercury's ________ and, therefore, the planet does not have seasons.
A. axial tilt is zero B. orbit is a perfect circle C. orbit is too close to the Sun D. atmosphere is almost nonexistent
In 1974, a radio message was sent out from the Arecibo observatory in Puerto Rico. About how far has it gotten by now?
A) just beyond our Solar System B) not even to the nearest stars C) a small fraction of the distance across the Milky Way D) almost to the center of the Milky Way E) beyond the Milky Way, to the Andromeda galaxy
A typical avocado has 180 Calories. If all this energy could be used to lift a bucket of water weighing 40 N, through what vertical distance could the bucket be lifted? (1 calorie = 4.184 J and 1 Calorie = 103 calories)
a. 1.72E+6 m b. 3.01E+7 m c. 7.53E+5 m d. 1.88E+4 m
Which two circuits are exactly equivalent?
a.
A and B
b.
B and C
c.
C and D
d.
D and E
e.
B and E