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)
<u><em>Speed = </em></u>
<u><em>(circumference) · (nr of revs) / (second) .</em></u>
(a). Speed = (2π) (8km) · (9 rev) / sec
Speed = (2π · 8 · 9) km/sec
Speed = 144π km/sec
<em>Speed = 452.4 km/sec</em>
(b). Speed = (2π) (16km) · (9 rev) / sec
Speed = (2π · 16 · 9) km/sec
Speed = 288π km/sec
<em>Speed = 904.8 km/sec</em>
(c). 300,000 km/sec = (2π · distance) · (9 / sec)
300,000 km = (18π · distance)
Distance = 300,000 / 18π km
<em>Distance = 5,305 km</em>
Answer:A loudspeaker produces a musical sound by means of the oscillation of a diaphragm. The loudness of sound produced depends upon Amplitude of vibration.
<u>Explanation:</u>
The loudness of a sound depends upon the amplitude of vibrations. A sound will be louder if the amplitude of vibration is greater but if it is smaller than sound will not be louder.
Now it is the vibration of a sound that determines it's amplitude. Amplitude signifies the maximum distance moved. It means the extent of vibration If is vibrations have more amplitude than sound will be louder but if the amplitude of vibrations is shorter than the sound will be softer.
<span>The nature of potential energy is that the zero point is arbitrary; it can be set like the origin of a coordinate system. That is not to say that it is insignificant; once the zero of potential energy is set, then every value of potential energy is measured with respect to that zero. Another way of saying it is that it is the change in potential energy which has physical significance.
Hope this Helps! </span>
Answer:The lower the refractive index, the faster the velocity of light. Medium A has the smaller refractive index. Light will travel faster through medium A at a velocity equal to the speed of light divided by the refractive index.
Explanation:
THere ya go ! :)
The answer is B I hope this helps luv