Question

Planet Earth has a mass of 5.9726 × 10 24 kilograms. And although 70% of the Earth's surface is made of water, the water's mass is only 5 × 10 -4 percent of the Earth's total mass. Use scientific notation to estimate the mass of the planet's water. In your final answer, include all of your estimates and calculations.

Answer 1

Answer:

mass of water = 2.9863 * 10^19 kg

Step-by-step explanation:

Mass of Earth: 5.9726 * 10^24 kg

Mass of water is 5 * 10^(-4) % of the mass of Earth

To find a percent of an amount, multiply the percent by the amount.

To change a percent to a decimal, divide the percent by 100.

The mass of the water on Earth is the percent multiplied by the mass of Earth.

mass of water = 5 * 10^(-4) % * 5.9726 * 10^24 kg

We now change the percent to a decimal by dividing the percent by 100.

mass of water = 5 * 10^(-6) * 5.9726 * 10^24 kg

mass of water = 5 * 5.9726 * 10^(-6) * 10^24 kg

mass of water = 29.863 * 10^(-6 + 24) kg

mass of water = 29.863 * 10^18 kg

The number above is not in scientific notation because 29.863 is not from 1 to under 10. We divided 29.863 by 10, and multiply 10^18 by 10.

mass of water = 2.9863 * 10^19 kg

Answer 2

Answer:

Step-by-step explanation:

you do 5 times 10 to the power of negitive 4

so 5 x 10 = 50

 50^-4=16250000 or 1652x10^4