When a spacecraft is launched from the earth toward the sun, at what distance from center of the earth will the gravitational forces exerted on it by the sun and earth cancel?
Earth's mass is 5.97 × 1024 kg, the sun's mass is 1.99 × 1030 kg, and the Earth-sun distance is 1.5 × 1011 m.
A) 1.3 × 108 m
B) 2.6 × 108 m
C) 1.3 × 1010 m
D) 2.6 × 1010 m
B
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Why was the discovery of Mercury's liquid core a surprise to scientists?
A. Mercury's rotation was too slow to sustain a liquid core. B. Mercury's small size should have allowed it to cool early in its history. C. Mercury's density suggested that there should have been a small solid core. D. Mercury's magnetic field was too weak to be generated by a liquid core.
The element symbol C stands for cobalt
a. True b. False Indicate whether the statement is true or false
The Sun's photosphere is, by mass, about 25%
a. helium. b. carbon. c. hydrogen. d. oxygen.
Rank the potential energies of the four systems of particles shown in Figure OQ25.5 from largest to smallest. Include equalities if appropriate