Question
What is the radius of the earth $(6380 \mathrm{km})$ expressed in units of the Planck length?
Step 1
We know that 1 kilometer is equal to 1000 meters. So, we multiply the given radius of the Earth (6380 km) by 1000 to get the radius in meters. \[6380 \, \text{km} = 6380 \times 10^3 \, \text{m} = 6.38 \times 10^6 \, \text{m}\] Show more…
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