Halle la velocidad de las ondas de una cuerda de violin de 820 g/m y 22cm de longitud, si la frecuencia de la fundamental es de
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The basic relationship between wavelength 
, frequency f and speed c of an electromagnetic wave is
where c is the speed of light. Substituting numbers, we find:
where c is the speed of light. Substituting numbers, we find:
Answer:
the angular velocity of the carousel after the child has started running =
Explanation:
Given that
the mass of the child = m
The radius of the disc = R
moment of inertia I =
change in time =
By using the torque around the inertia ; we have:
T = I×∝
where
R×F = I × ∝
R×F = ∝
F = ∝
∝ = ( expression for angular angular acceleration)
The first equation of motion of rotating wheel can be expressed as :
where ;
∝ =
Then;
∴ the angular velocity of the carousel after the child has started running =