A satellite is in circular orbit at an altitude of 1500 km above the surface of a nonrotating planet with an orbital speed of 9.2 km/s
The minimum speed needed to escape from the surface of the planet is 14.9 km/s, and G = 6.67 × 10-11 N ? m2/kg2. The orbital period of the satellite is closest to
A) 72 min.
B) 65 min.
C) 58 min.
D) 51 min.
E) 44 min.
A
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If the Universe is closed and finite, then
a. the Universe will expand forever. b. the Universe has a center. c. the Universe has an edge. d. None of the other choices are correct.
Charge is distributed uniformly on the surface of a spherical nonconducting shell. A point particle with charge q is inside. The electrical force on the particle q is least when:
A) it is near the inside surface of the shell B) it is at the center of the shell C) it is halfway between the shell center and the inside surface D) it is near, but not at, the center of the shell E) all of the above (the force is zero everywhere inside)
The first eukarya appeared
A) 4.6 billion years ago B) around 3.5 billion years ago C) 4.0 billion years ago D) at least 2.1 billion years ago or perhaps even earlier
In an X-ray tube, high-speed electrons are slammed into a lead target, giving off X-rays. If the electrons are accelerated from rest through a potential difference of 100,000 volts, what speed do they have when they strike the target? (qe = 1.6 × 10^-19 C, me = 9.11 × 10^-31 kg, and c = 3.00 × 10^8 m/s)
a. 0.17c c. 0.91c b. 0.41c d. 0.55c