Posted by **rick** on Monday, April 14, 2008 at 9:13pm.

A law enforcement officer in an intergalactic "police car" turns on a red flashing light and sees it generate a flash every 1.5 s. A person on earth measures that the time between flashes is 2.9 s. How fast is the "police car" moving relative to the earth?

## Answer This Question

## Related Questions

- math - on a radio tower, a red light flashes every 6 seconds and a blue light ...
- Math - If a red light flashes every 3 seconds, a blue light flashes every 4 ...
- general ability - light X flashes every 3 minutes. Light Y flashes every 5 ...
- Math :/ - A light flashes every 15 minutes. a second light flashes every 18 ...
- math - A lighthouse flashes its light every 12 minutes.Another lighthouse ...
- Math - Three lighthouses on three nearby islands flash their lights every ...
- MATH - One light flashes every 2 minutes and another light flashes every 3.5 ...
- MATH - One light flashes every 2 minutes and another light flashes every 3.5 ...
- maths - a light house flashes every 56 seconds. Another lighthouse flashes every...
- Math - the green light flashes every 3 seconds,the red every 5 seconds and white...

More Related Questions