310 Part Four / Astronomy ACTIVITY 18.5A Rotation and Rev Use the p 1. How long

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310 Part Four / Astronomy ACTIVITY 18.5A Rotation and Rev Use the p 1. How long is the rot 2. How long is the period of rotation of Jupiter? 3. Compare the periods of rotation of the terrestrial planets to those of the Jovian planets Geo lanetary data in Table 18.1 to answer the following questions. e period of rotation of Mercury? (Nore: The small d by the number stands for "Earth days.) days hours PYo the e on the equator of Jupiter and ) in about 4. Jupiter rotates once on its axis approximately every 10 hours. If an object wer rotating with it, it would travel approximately 280,000 miles (the distance around Jupiter's equator 0 hours. Calculate the equatorial rotational velocity of Jupiter, using the fellowing formula: miles Velocity = Distance Time hour 5. The distance around Earth's equator is about 24,000 miles. Use the formula in Question 4 to calculate the approximate rotational velocity at Earth's equator mph 6. How many times faster is Jupiter's equatorial rotational velocity than Earth's? times faster Earth year, how many revolutions (trips around the Sun) will Mercury complete? What fraction of a revolu tion will Neptune accomplish? Mercury: revolutions in 1 Earth year of a revolution in 1 Earth year Neptune 8. How many rotations on its axis will Mercury complete in 1 of its years? Mercury: rotations in 1 Mercury year 9. On average, do the terrestrial planets have longer or shorter periods of rotation than the Jovian planets? Are the terrestrial planet years longer or shorter than those of the Jovian planets? Terrestrial planet days are Terrestrial planet years are ACTIVITY 18.5B Kepler's Third Law of Planetary Motion In the early 1600s, Johannes Kepler established three laws of planetary motion. According to Kepler's third law the period of revolution of a planet, measured in Earth years, is related to its distance from the Sun in astronomi- cal units. One astronomical unit (AU) is defined as the average distance from the Sun to Earth-93 million miles or 150 million kilometers. The law states that a planet's orbital period squared is equal to its mean solar distance cubed: p2 d. Applying Kepler's third law, what would be the period of revolution of a hypothetical planet that is 4 AUs from the Sun? Show your calculation in the following space

Explanation / Answer

18.5A

1) 176 earth days

2) 9hours 56minutes

3) Earth and mars have the same time of roation with mars 40min more than earth and jupitar is just 9hrs and mercury is 175days for one single rotation

4) 2545 miles/hr

5) 1000 miles/hr

6) 10 times faster

7) Mercury 4.15 revolution

Neptune 0.09 revolution

8) 2 revolution around the sun

9) 243 days

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