Case Study From Figure 8.1B for Comet Halley, is the comet speeding up, slowing down, or maintaining its speed just before it reaches aphelion? What about just after it passes aphelion? Explain.
Whether Comet Halley is speeding up, slowing down, or maintaining its speed just before it reaches aphelion and just after it passes aphelion.
Answer to Problem 1PQ
The comet Halley is slowing down just before it reaches aphelion and is speeding up just after it passes aphelion.
Explanation of Solution
Comet Halley is a comet having a period of revolution of
From figure 8.1B, angle between gravitational force of sun on comet and velocity of comet is greater than
Conclusion.
The comet Halley is slowing down just before it reaches aphelion and is speeding up just after passes aphelion.
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