Bennett Mechanical Comprehension Practice Test 2026 – The Complete All-in-One Guide to Exam Success!

To determine the rotation speed of a point on the Earth's surface, we need to consider the circumference of the Earth and how long it takes for the Earth to complete one full rotation.

The formula for the circumference \( C \) of a circle is given by:

\[

C = 2 \pi r

\]

where \( r \) is the radius of the Earth. Plugging in the average radius of Earth (approximately 6370 km), the circumference becomes:

\[

C = 2 \pi \times 6370 \text{ km} \approx 40030 \text{ km}

\]

The Earth completes one full rotation in approximately 24 hours. To find the speed at which a point on the equator moves due to this rotation, we divide the circumference by the time it takes for one full rotation:

\[

\text{Speed} = \frac{C}{\text{Time}} = \frac{40030 \text{ km}}{24 \text{ hours}} \approx 1667 \text{ km/h}

\]

Thus, the calculated speed is about 1667 km/h for a point at the equator. However, the question asks for the general rotation speed referring to