zulfiquer5541
29.06.2019 •
Physics
When a person plucks a guitar string, the number of half wavelengths that fit into the length of the string determines the of the sound produced.
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Ответ:
Frequency
Explanation:
Each half wavelength has a point of largest amplitude (aka a node). Depending on the wavelength each node oscillates at a certain rate of swings per unit of time. The latter is referred to as frequency and measure in Hertz [Hz].
Ответ:
Explanation:
The question says that, "After how long does a mobile acquire a speed of 30 m / s, if it starts from rest and its acceleration is 3 m / s*2"
Initial speed is 0
Final speed is 30 m/s
Acceleration a = 3 m/s²
It is required to find time when it acquire a speed of 30 m/s. Using equation of kinematics as :
So, after 10 seconds it will acquire a speed of 30 m/s.