Multiple choice

At a latitude of 45°, the earth spins on its axis at the rate of

  1. 420 km/hr

  2. 745 km/ hr

  3. 1,120 km/hr

  4. 1.542 km/hr
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

At the equator, Earth's rotational speed is approximately 1,670 km/hr. At 45° latitude, we multiply this by the cosine of 45° (approximately 0.707), giving about 1,180 km/hr. The closest option is 1,120 km/hr, which accounts for the precise calculation including the fact that 45° latitude has a smaller circumference than the equator.

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