The density of an object can be found by dividing the mass of the object by its volume. The volume of the Earth is 2.1\times 10^{11}2.1×10
11
cubic meters and its mass is 7\times 10^{24}7×10
24
kilograms. What is the density of the Earth in kilograms per cubic meter? Answer should be in scientific notation with first number being rounded to the hundredths place.

the answer is 489

step-by-step explanation:

1,407.5 hours

step-by-step explanation:

we first convert all the time to hours and then sum them up.

there are 24 hours in 1 day, in 58 days, there are 24 x 58 = 1,392 hours.

there are 60 minutes in 1 hour, thus, 30 minutes will be equivalent to 30 / 60 = 0.5 hours.

therefore, the number of hours it will take mercury to complete a full rotation is 1,392 + 15 + 0.5 = 1,407.5 hours