The Moment of Inertia of the Disc is represented by  . (Correct answer: A)
. (Correct answer: A)
Let suppose that the Disk is a Rigid Body whose mass is uniformly distributed. The Moment of Inertia of the element is equal to the Moment of Inertia of the entire Disk minus the Moment of Inertia of the Hole, that is to say:
 (1)
 (1)
Where:
 - Moment of inertia of the Disk. - Moment of inertia of the Disk.
 - Moment of inertia of the Hole. - Moment of inertia of the Hole.
Then, this formula is expanded as follows:
  (1b)
 (1b)
Dimensionally speaking, Mass is directly proportional to the square of the Radius, then we derive the following expression for the Mass removed by the Hole ( ):
):


And the resulting equation is:



The moment of inertia of the Disc is represented by  . (Correct answer: A)
. (Correct answer: A)
Please see this question related to Moments of Inertia: brainly.com/question/15246709
 
        
             
        
        
        
Answer: The fundamental frequency of the slinky = 8Hz
An input frequency of 28 Hz will not create a standing wave
Explanation:
Let Fo = fundamental frequency 
At third harmonic, 
F = 3Fo
If F = 24Hz
24 = 3Fo
Fo = 24/3 = 8Hz
If an input frequency = 28 Hz at 3rd harmonic 
Let find the fundamental frequency 
28 = 3Fo
Fo = 28/3
Fo = 9.33333Hz
Since Fo isn't a whole number, it can't create a standing wave 
 
        
             
        
        
        
Answer:
induced EMF = 240 V
and by the lenz's law  direction of induced EMF is opposite to the applied EMF
Explanation:
given data 
inductance = 8 mH 
resistance = 5 Ω
current = 4.0 A
time t = 0
current grow = 4.0 A to 10.0 A 
to find out 
value and the direction of the induced EMF
solution
we get here induced EMF of induction is express as 
E = - L  ...................1
    ...................1
so E = - L 
put here value we get 
E = - 8 ×  
 
E = -40 ×  6 
E = -240 
take magnitude 
induced EMF = 240 V
and by the lenz's law we get direction of induced EMF is opposite to the applied EMF
 
        
             
        
        
        
Answer:
The number of complete vibration or wave made in
one second is called frequency.
 
        
             
        
        
        
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