Answer:

Explanation:
When an electromagnetic wave passes through the interface between two mediums, it undergoes refraction, which means that it bents and its speed and its wavelength change.
In particular, the wavelength of an electromagnetic wave in a certain medium is related to the index of refraction of the medium by:

where
 is the wavelength in a vacuum (air is a good approximation of vacuum)
 is the wavelength in a vacuum (air is a good approximation of vacuum)
n is the refractive index of the medium
In this problem:
 is the original wavelength of the wave
 is the original wavelength of the wave
n = 1.47 is the index of refraction of corn oil
Therefore, the wavelength of the electromagnetic wave in corn oil is:

 
        
             
        
        
        
Answer:
They will move the fridge if they all push in the same direction, but it will not move with constant velocity
Explanation:
The maximum static friction force is
 (negative sign since its direction is opposite to the push applied by the people)
 (negative sign since its direction is opposite to the push applied by the people)
Sam can apply a force of 130 N, while Amir and Andre can apply a push of 65 N each, so the total force that they can apply, if they push in the same direction, will be:

This force is larger than the frictional force, so the fridge will start moving.
However, the net force on the fridge will be:

And according to Newton's second law,

where m is the mass of the fridge and a its acceleration, since the net force is not zero, then the fridge will have a non-zero acceleration, so it will not move with constant  velocity.
 
        
             
        
        
        
Answer:
100 cc 
Explanation:
Heat released in cooling human body by t degree
= mass of the body x specific heat of the body x t
Substituting the data given 
Heat released by the body 
= 70 x 3480 x 1 
= 243600 J
Mass of water to be evaporated 
= 243600 / latent heat of vaporization of water
= 243600 / 2420000 
= .1 kg
= 100 g 
volume of water
= mass / density
= 100 / 1
100 cc 
1 / 10 litres.
 
        
             
        
        
        
Answer:
Part a)

Part b)

Part c)

Part d)

Explanation:
Part a)
While bucket is falling downwards we have force equation of the bucket given as

for uniform cylinder we will have

so we have


now we have




now we have


Part b)
speed of the bucket can be found using kinematics
so we have



Part c)
now in order to find the time of fall we can use another equation



Part d)
as we know that cylinder is at rest and not moving downwards
so here we can use force balance



 
        
             
        
        
        
Magnitude of displacement = 
Adding the squares gives displacement = 
Displacement =   ≈ 724.7m
 ≈ 724.7m