Answer:
As collision is elastic,thus we can use conservation of momentum equation
mA=0.2 kg
(vB)1=0 m/s.......................as it is on rest before collision
(vA)1=4 m/s
(vA)2=-1 m/s
(vB)2=2 m/s
using equation
(mA*vA+mB*vB)1= (mA*vA+mB*vB)2
Where 1 and 2 represents before and after collision
(0.2*4)+(mB*0)=(0.2*-1)+(mB*2)
0.8=-0.2+(2mB)
mass of object B=mB=0.3 Kg
 
        
             
        
        
        
Answer:
the answer is most likely likely to be 2
 
        
             
        
        
        
Answer:
W= 210 N
Explanation:
Just use work = Fparallel*d
W= 35*6
W= 210 N
 
        
             
        
        
        
Answer:
58.27 N
Explanation:
the data we have is:
mass: 
coefficient of friction: 
and we also know the acceleration of gravity is 
We need to do an analysis of horizontal and vertical forces acting on the object:
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Vertically the forces acting on the object:
- Normal force  (acting up from the object) (acting up from the object)
- weight:  (acting down from) (acting down from)
so the sum of forces in the vertical axis "y" are:

from Newton's second Law we know that  , so:
, so:

and since the object is not accelerating in the vertical direction (the movement is only horizontal)  , and:
, and:

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now let's analyze the horizontal forces
- frictional force:  and since and since --> --> 
- force to move the object:  
and the two forces just mentioned must be opposite, thus the sum of forces in the "x" axis is: 

and we are told that the crate moves at a steady speed, thus there is no acceleration: 
and we get:

substituting known values:

 
        
             
        
        
        
The period is the time taken by the wave to complete an oscillation. The frequency of the given sound is 500 Hz.
<h2>
Period:</h2>
It is the time taken by the wave to complete an oscillation. The frequency is inversely proportional to the time:

Where,
 - frequency
- frequency 
 - period = 0.002 s
 - period = 0.002 s
Put the value in the equation,

Therefore, the frequency of the given sound is 500 Hz.
Learn more about Period:
brainly.com/question/842349