The correct answer is refraction.
        
             
        
        
        
Answer:
100m
Explanation:
conversation km to meter
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Answer:
Magnetic field, 
Explanation:
Given that,
Velocity of electron, 
It enters  a region of space where perpendicular electric and a magnetic fields are present.
Magnitude of electric field, 
We need to find the magnetic field will allow the electron to go through the region without being deflected. 
Magnetic force on the electron,  .......(1)
.......(1)
Electric force on the electron, F = q E........(2)
From equation (1) and (2) we get:



B = 0.0002 T
or

Hence, this is the required solution.
 
        
             
        
        
        
Answer:

Explanation:
Let the height of the ladder be L

Also:
- Let  
- Let  
When the ladder leans against the wall, it forms a triangle and the length of the ladder forms the hypotenuse.
So, we have:
 --- Pythagoras Theorem
 --- Pythagoras Theorem
When the base is 9ft from the wall, this means that:

Substitute 9 for x and 10 for L in 


Make  the subject
 the subject


Make y the subject


<em>Hence, the true distance at that point is approximately 4.36ft</em>
 
        
             
        
        
        
 To solve this problem we will use the kinematic formula for the final velocity.
 
 The final speed is 0 at the moment the player stops.
 The time until it stops is 1.3 s
 The initial speed is 200 feet / s  Note (check the speed units in the problem statement, 200ft / s is very much and 200ft / h is very small)
 Then, we clear the formula.
 
 Because the player is slowing down, the acceleration goes in the opposite direction to the player's movement, and that is why it is negative.
 To answer part b) we use the following formula.
 