Question

The speed of earth’s rotation at the equator is ________km per hour.
A. 16650
B. 1562
C. 1670
D. none of the above

Answer 1

Hint: The Planet rotates around its axis in the same way as a top rotates around its spindle. The rotation of the Planet is the name given to this rotating motion. The Planet orbits or revolves around the Sun at the same time it turns on its axis. Revolution is the name given to this movement.

Complete answer:
An equator is an imaginary line that circles a planet or other celestial body in the Centre. At 0 degrees latitude, it is halfway between the North Pole and the South Pole. The world is split into two parts by an equator: the Northern Hemisphere and the Southern Hemisphere. At its Equator, the Earth is the largest.
The sidereal duration is 23 hours, 56 minutes, and 4.09053 seconds, and the earth's diameter is approximately 40,075 kilometers. At the equator, the earth's crust travels at a rate of 460 meters per second, or around 1,000 miles per hour.

Circumference of the Planet at the Equator = 40,000 kilometers; Earth's rotation speed at the Equator = 40,000 kilometers
One Rotation takes 24 hours to complete.
$\dfrac{40,000 km}{24 hour}= 1670 km/hr. = Rotational Speed = \dfrac{Distance}{Time}$

Hence, the correct answer is option C.

Note:
Greenwich Mean Time (GMT) is the solar time at the Royal Observatory in Greenwich, London, as measured from midnight. It has been measured in a number of ways in the past, including using noon as a starting point; as a result, it cannot be used to specify a particular time unless a context is provided. The Prime Meridian, which runs north and south, is used to measure Greenwich Mean Time.