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what is the linear speed of Santa Fe around the earth's axis in mi/hr

699427535

New member
Feb 24, 2019
2
Santa Fe is approximately 33.88 degrees north of the equator. Given that the earth's radius at the equator is 3960 mi and the earth spins around its axis completely in 24 hours, what is the linear speed of Santa Fe around the earth's axis in mi/hr?

I don't know where to start! Thank you so much!
 

MarkFL

Administrator
Staff member
Feb 24, 2012
13,736
Consider the following diagram showing a cross-section of the Earth cut with a plane containing the axis of rotation. the vertex of the right triangle containg the angle \(\theta\) is at the center of the Earth. The value \(a\) is the radius of the circular path of Sante Fe as the Earth rotates.

mhb_0009.png

Can you find a way to relate the radius of the Earth \(r_E\), the latitude \(\theta=33.88^{\circ}\) and \(a\)?
 

699427535

New member
Feb 24, 2019
2
Thank you so much! I figured it out as soon as I saw your diagram.