Answer:
Friction does not oppose motion, it oppose relative motion.
Explanation:
static friction opposes relative motion
Answer:
Speed = Wavelength x Frequency.
The sound is perceived as louder if the amplitude increases, and softer if the amplitude decreases. As the amplitude of the sound wave increases, the intensity of the sound increases. Sounds with higher intensities are perceived to be louder.
Answer:

Explanation:
It is given that,
The frequency of monochromatic light, 
Slit separation, 
Let
is the angle away from the central bright spot the third bright fringe past the central bright spot occur. The condition for bright fringe is :

n = 3


So, at 4.64 degrees the third bright fringe past the central bright spot occur. Hence, this is the required solution.
Answer:
The length is 
Explanation:
From the question we are told that
The length of the wire 
The mass is 
The tension is 
Generally the frequency of oscillation of a stretched wire is mathematically represented as

Where n is the the number of nodes = 3 (i.e the third harmonic)
is the linear mass density of the wire
This linear mass density is mathematically represented as
Substituting values


Substituting values in to the equation for frequency


From the question the we can deduce that the fundamental frequency is equal to the oscillation of a stretched wire
The fundamental frequency is mathematically represented as

Where
is the length of the pipe
v is the speed of sound with a value of 
Making
the subject of the formula
Substituting values


From the question the we can deduce that the fundamental frequency is equal to the oscillation of a stretched wire