306 308 Part Four/Astronomy densiny of As a reference, the d mass per unit volum

Question

306 308 Part Four/Astronomy densiny of As a reference, the d mass per unit volume of a substance. In Table 18.1, t Density is the mass per of the planets are expressed in grams per ater is approximately 1 gram per cubic centimeter cubic centimeter. ACTIVITY 18.4A omparing Planetary Masses ing the masses of the planets provided in Table 18.1, complete the following. massive is this planet than Earth? the at is the most massive planet in the solar system? How many times more Most massive planet: This planet is times more massive than Earth 2. Which is the least massive planet? What is its mass as a percentage of Earth's mass? Least massive planet This planet is only percent as massive as Earth. 3. Given the fact that t ven the fact that the gravitational attraction of a body is directly related to its mass, w reatest gravitational attraction? Which planet exerts the least attraction? Greatest gravitational attraction: Least gravitational attraction surface gravities of Mars and Jupiter are, respectively, about 0.4 and 2.5 times that of Earth. What would be the approximate weight of a 200-pound person on these planets? This person would weig This person would weigh pounds on Mars. pounds on Jupiter. ich of the two groups of planets is more likely to attract and hold low-density gaseous material, such as hydrogen and helium? 5. Wh ACTIVITY 18.4B Comparing the Number of Moons to Planetary Masses led "Number of Known Satellites"in Table 18.1 indicates the number of known moons orbiting each The column label planet 1. Write a brief statement comparin g the number of known moons orbiting the terrestrial planets to the number orbiting the Jovian planets 2. What is the relationship between a planet's number of moons and its mass? Suggest a rea ACTIVITY 18.4C Comparing a Planet's Diameter to lts Density 1. Use the data in Table 18.1 to complete the graph in FIGURE 18.2 by following these instructions a. Using two different colored pencils (one for the terrestrial planets and a different one for the Jovian planets) plot a point on the graph for each planet at the place where its diameter and density intersect.

Explanation / Answer

Solution :-

1) The most massive planet :- JUPITER

The planet is 318 times more massive than earth.

2) Least massive planet : MERCURY

It is only 5% as massive as earth.

3) Greatest garvitational attraction : JUPITER

least gravitational attraction : MERCURY

4) Mass on earth is directly proportional to mass on any other planet i.e Mars/ Jupiter/Saturn.

According to the question ,

Mass on mars = surface gravity*mass on earth

= 0.4*200

= 80lbs.

Similarly mass on Jupiter = 500lbs.(ANS)

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