Changing the medium of the wave.
Waves is always determined by the properties of the medium, which means that changing the medium will change the velocity of the wave
Mass of yellow train, my = 100 kg
Initial Velocity of yellow train, = 8 m/s
mass of orange train = 200 kg
Initial Velocity of orange train = -1 m/s (since it moves opposite direction to the yellow train, we will put negative to show the opposite direction)
To calculate the initial momentum of both trains, we will use the principle of conservation of momentum which
The sum of initial momentum = the sum of final momentum
Since the question only wants the sum of initial momentum,
(100)(8) + (200)(-1) = 600 m/s
Yes, that is truly amazing.
They significantly reduced the noise's intensity by 90%, that might be proper reaction.
<h3>What is noise?</h3>
- Unwanted sound that is regarded loud, unpleasant, or disruptive to hearing is called noise.
- Physically speaking, there is no difference between unwanted sound and desired sound because both are vibrations traveling through a medium like air or water.
- When the brain receives and interprets a sound, a difference occurs.
- Decibels are used to measure sound (dB).
- A motorcycle engine operating is roughly 95 dB louder than regular conversation, which is around 60 dB louder than a whisper.
- Your hearing may begin to be harmed if exposed to noise over 70 dB for an extended period of time.
- Your ears can suffer instant damage from loud noise above 120 dB.
<h3>What is sound intensity?</h3>
- The power carried by sound waves per unit area in a direction perpendicular to that region is known as sound intensity or acoustic intensity.
- The watt per square meter is the SI measure of intensity, which also covers sound intensity.
Learn more about sound here:
brainly.com/question/14595927
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Answer:
The arrow is at a height of 500 feet at time t = 2.35 seconds.
Explanation:
It is given that,
An arrow is shot vertically upward at a rate of 250 ft/s, v₀ = 250 ft/s
The projectile formula is given by :
We need to find the time(s), in seconds, the arrow is at a height of 500 ft. So,
On solving the above quadratic equation, we get the value of t as, t = 2.35 seconds
So, the arrow is at a height of 500 feet at time t = 2.35 seconds. Hence, this is the required solution.
