Answer:
I'dont know sooooooooooooooooooooooorrrrrrrrrrrrrrrrry
 
        
                    
             
        
        
        
Answer:
0.47 m
Explanation:
 = Number of vibrations = 37
 = Number of vibrations = 37 
 = total time taken = 33 s
 = total time taken = 33 s 
 = time period of each vibration
 = time period of each vibration
frequency of vibration is given as 
 Hz
 Hz
 = distance traveled along the rope = 421 cm = 4.21 m
 = distance traveled along the rope = 421 cm = 4.21 m 
 = time taken to travel the distance = 8 s
 = time taken to travel the distance = 8 s
 = speed of the wave
 = speed of the wave
Speed of the wave is given as 

 = wavelength of the harmonic wave
 = wavelength of the harmonic wave 
wavelength of the harmonic wave is given as 

 
        
                    
             
        
        
        
The whistling sound from the hearing aids represents that your hearing aids is working perfectly ad is known as the "feedback". So, the given statement is true.
Answer: Option A
<u>Explanation:</u>
It's often sounds irritating when a hearing aids of your grandpa or Grandma whistles. especially, when they put them out of their ears. Actually, this feedback sound from hearing aids occur when the sounds from the outer side  bounces back to the microphone of the hearing aids.
The sound bounces back when it doesn't gets inside of your ear canal so that one can hear the sound through the hearing aid. When the sounds bounces back in the hearing aid, it get re-amplified and thus we hear the whistle sound which is known as the feedback of the device.
It's not always the feedback sound though. Sometimes the device whistles when it has some mechanical defect or when one hugs the other one or water gets inside and damaged the whole system.
 
        
             
        
        
        
Answer:
539 kPa
Explanation:
Pressure equals density times acceleration of gravity times depth.
P = ρgh
Water has a density of 1000 kg/m³, and acceleration of gravity is 9.8 m/s².
P = (1000 kg/m³) (9.8 m/s²) (55.0 m)
P = 539,000 Pa
P = 539 kPa
 
        
             
        
        
        
Can you please translate to English?