- The wavelength of the red light in "nanometer" is 7×  
- Wavelength is given as : 7× meter meter
-  1 nanometer =  ( meter) meter)
- Let X= value of the wavelength in nanometer.
 1 nanometer  =  meter
 meter
X  nanometer = 7×  meter
  meter
- <em>If we Cross multiply</em>
X  nanometer = ( )
)
X= 7× nanometer
  nanometer
Therefore, the wavelength in "nanometer" is 7× 
 
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Answer:
The resultant velocity is <u>169.71 km/h at angle of 45° measured clockwise with the x-axis</u> or the east-west line.
Explanation:
Considering west direction along negative x-axis and north direction along  positive y-axis
Given:
The car travels at a speed of 120 km/h in the west direction.
The car then travels at the same speed in the north direction.
Now, considering the given directions, the velocities are given as:
Velocity in west direction is, 
Velocity in north direction is, 
Now, since  are perpendicular to each other, their resultant magnitude is given as:
 are perpendicular to each other, their resultant magnitude is given as:

Plug in the given values and solve for the magnitude of the resultant.This gives,

Let the angle made by the resultant be 'x' degree with the east-west line or the x-axis.
So, the direction is given as:

Therefore, the resultant velocity is 169.71 km/h at angle of 45° measured clockwise with the x-axis or the east-west line.
 
        
             
        
        
        
The answer is A
Good luck!
        
             
        
        
        
Answer:
angular acceleration is -0.2063  rad/s²
Explanation:
Given data 
mass m = 95.2 kg
radius r = 0.399 m
turning ω = 93 rpm
radial force N  = 19.6 N
kinetic coefficient of friction  μ = 0.2
to find out 
angular acceleration
solution
we know frictional force that is = radial force × kinetic coefficient of friction
frictional force = 19.6 × 0.2 
frictional force = 3.92 N
and 
we know moment of inertia  that is 
 γ =  I ×α = frictional force × r
so 
 γ  = 1/2 mr²α 
α  = -2f /mr 
α  = -2(3.92) /95.2 (0.399) 
α  = - 7.84 / 37.9848 = -0.2063 
so angular acceleration is -0.2063  rad/s²
 
        
             
        
        
        
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