Please help ill give you 30 points

If a clock aboard a space ship traveling at 0.900 c of the speed of light relative to earth chimes once at the beginning of the hour and again when it reads one hour later, how much time would an observer on earth say elapsed between the two chimes?

When a book falls from a shelf to the ground without anyone pushing on it, no work is done on the book. true or false

Where should a carbon monoxide detector be mounted?