Why does a satellite in elliptical orbit gain speed as it moves closer to the planet? When is its kinetic energy greatest? Least? Where is its potential energy greatest? The least?
What will be an ideal response?
Answer: The sum of a satellite's potential and kinetic energies remains constant if the satellite is in a closed orbit about a planet. As the satellite moves closer to the planet, it falls with gravity and gains speed. Potential energy decreases, kinetic energy correspondingly increases, and hence speed increases. As it moves farther from the planet, it moves against gravity, its kinetic energy decreases, and its potential energy increases. Its potential energy is greatest when the satellite is farthest from the planet, and least when it is closest to the planet.
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A natural gas pipeline with a diameter 0.250 m delivers 1.55 cubic meters of gas per second. What is the flow speed of the gas in the pipeline?
What will be an ideal response?
What is the escape speed from a planet of mass m and radius r if m = 3.2 × 10^23 kg and r = 2.4 × 10^6 m?
a. 5.5 km/s b. 4.2 km/s c. 5.2 km/s d. 4.8 km/s e. 3.7 km/s
In a flowing fluid, the pressure where the fluid is moving slower is higher than the pressure where the fluid is moving faster
a. True b. False Indicate whether the statement is true or false
A string is stretched and fixed at both ends, 200 cm apart. If the density of the string is 0.015 g/cm, and its tension is 600 N, what is the fundamental frequency?
a. 316 Hz b. 632 Hz c. 158 Hz d. 215 Hz e. 79 Hz