ACTIVITY 5
Working with Kepler's Laws
23
B
0
7. Examine Figure 5.3, which s...
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Biology, 12.02.2021 05:50, ryanez5306
ACTIVITY 5
Working with Kepler's Laws
23
B
0
7. Examine Figure 5.3, which shows a planet, D, orbiting the Sun, A, in a counterclockwise
direction. Match the following terms with the letter that identifies the location in the figure:
β’ focus
aphelion
perihelion
β’ increasing speed
β’ decreasing speed
planet has fastest speed
planet has slowest speed
FIGURE 5.3
8. State Kepler's second law and give the physical reason why planets behave this way.
to
to
D
Not to scale
.
Step 4-Kepler's Third Law
Kepler's third law relates the time it takes a planet to go around the Sun (the period, P) to the
semimajor axis, A, of the orbit. If we measure Pin years and A in astronomical units (AU), the
simplified relationship (formula) is:
p2 = A3
9. According to Kepler's third law, all orbits with the same semimajor axis have the same period.
The two orbits in Figure 5.4 have the same value for A and thus must have the same P, but
how is this possible when the orbits have such different eccentricities? (Hint: With a circular
orbit, e = 0, does the distance of an object orbiting the Sun change?)
FIGURE 5.4
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