top of page
Writer's picturekeshprad

PhysicsBowl 2018 Q9


9) This question asks us to find the surface area of Earth. We are given the diameter of Earth, in kilometers. We can approximate Earth as a sphere, and use the equation for the surface area of a sphere.

Where SA is surface area, and r is radius

Before we go ahead and plug in our given value we need to consider a few things. Firstly, we are given the diameter of the Earth, so we need to divide by 2 to find the radius. Additionally, we want the surface area in square meters, but the diameter is given in kilometers.

Where d is diameter, r is radius, and SA is surface area

Answer: B

Comments

bottom of page