A certain spherical asteroid has a mass of 3.5 × 1016 kg and a radius of 8.8 km. What is the minimum speed needed to escape from the surface of this asteroid? (G = 6.67 × 10-11 N ? m2/kg2)
A) 23 m/s
B) 16 m/s
C) 520 m/s
D) 730 m/s
A
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Two identical particles move toward each other, one twice as fast as the other. Just before they collide, one has a kinetic energy of 25 J and the other 50 J. At this instant their total kinetic energy is
A) 25 J. B) 50 J. C) 75 J. D) none of the above E) need more information
During its early history, matter dominated the Universe
a. True b. False Indicate whether the statement is true or false
Two springs, each with spring constant k, are attached end to end in a series fashion. A second pair of identical springs are also attached in series fashion. Then the pair of series attached springs are attached in parallel to each other. What is the effective spring constant of the resulting combination of springs?
a. k/2 b. 2k c. either k/4 or 4k d. k