According to the theory of special relativity in physics, it is not possible for an object with mass to travel at the speed of light. As an object with mass approaches the speed of light, its mass would increase, requiring an infinite amount of energy to reach or exceed the speed of light.
However, if we hypothetically assume that it is possible to travel at the speed of light, we can calculate the number of rotations around the Earth in one second. The circumference of the Earth at the equator is approximately 40,075 kilometers (24,901 miles).
Since the speed of light in a vacuum is approximately 299,792,458 meters per second, we can convert the Earth's circumference to meters (1 kilometer = 1000 meters) and divide it by the speed of light to find the number of rotations:
40,075 kilometers * 1000 meters/kilometer / 299,792,458 meters/second ≈ 133.7 rotations per second
Therefore, if we could travel at the speed of light, we would hypothetically be able to complete around 133.7 rotations around the Earth in one second. However, please keep in mind that this calculation is purely theoretical and does not align with our current understanding of physics.