Solve this question pleas Planetary data taken from Allen\'s Astrophysical Quant

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Solve this question pleas

Planetary data taken from Allen's Astrophysical Quantities, 4th edition, Ed. Arthur Cox. Fill in the missing data for the Density (= Mass/Volume) and Relative density in Table 1. Pay attention to significant figures and units. Assume that each planet is a sphere. Note that the relative density is the planet's density divided by the density of water (= 1 g/cm3). If an object has a relative density less than 1 it will float in water. Are there any planets that would float in a giant tub of water? The Sun is far enough away that it takes a certain amount of time for its light to reach the Earth. An astronomical unit (A.U.) is defined as the average distance from the Earth to the Sun and is about 1.5x108 km. If the Sun suddenly went dark, how long would it be before we even found out given that the speed of light is 3x108 m/s. Express your answer in minutes.

Explanation / Answer

All measures in grams per cubic centimeter (g/cm3):

Relative Densities

Saturn will float in the huge tub of water

Now second part

AS
Distance = (Speed x Time)

we have speed and distance we need to calculate time so formula will be

Time = Distance/speed

So

Time= 1500 *10^8 /3*10^8

Time= 500 *10^8 seconds

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