NEED HELP ASAP !!!!!!! anyone gonnna answerrr????

Physics

1 answer:

shepuryov [24]3 years ago

7 0

The 'spot' at the end of the laser beam moves in a circle. The radius of the circle is the distance between the laser and the spot.

The circumference of every circle is (2π) · (radius) .

The speed of the spot is (distance) / (time) .

Speed = (circumference) / (time to turn once around the full circle)

Speed =

(circumference) · (nr of revs) / (second) .

(a). Speed = (2π) (8km) · (9 rev) / sec

Speed = (2π · 8 · 9) km/sec

Speed = 144π km/sec

Speed = 452.4 km/sec

(b). Speed = (2π) (16km) · (9 rev) / sec

Speed = (2π · 16 · 9) km/sec

Speed = 288π km/sec

Speed = 904.8 km/sec

(c). 300,000 km/sec = (2π · distance) · (9 / sec)

300,000 km = (18π · distance)

Distance = 300,000 / 18π km

Distance = 5,305 km

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