It wouldn’t need to break the sound barrier. Killing someone once a day should mean one death every 24 hours (assuming the hand uses its own hand time zone).
The Earth’s circumfrence is about 40,000 km, meaning the hand would need to travel at most 20,000 km in 24 hours which requires a speed of 833 km/h, whereas the speed of sound is 1235 km/h.
It wouldn’t need to break the sound barrier. Killing someone once a day should mean one death every 24 hours (assuming the hand uses its own hand time zone).
The Earth’s circumfrence is about 40,000 km, meaning the hand would need to travel at most 20,000 km in 24 hours which requires a speed of 833 km/h, whereas the speed of sound is 1235 km/h.
You are right, thank you! Unless the Hand wants to get there early so it can spend 12 hours hovering ominously over the person its going to kill.