In one quadrant there are 90 degrees.
 
        
             
        
        
        
Answer:
true
Explanation:
free fall is said to be the downward movement of an object under the force of gravity only
 
        
             
        
        
        
Answer:
 All of the above are true.
Explanation:
(a). true   
whenever  charge particle  move back and froth from its mean position then it will produce oscillating electric and magnetic fields, . so an em wave can be obtain by accelerating charge 
 (b). true 
 the electric field and the magnetic field have vibrations in the perpendicular direction along  the motion of the wave  so electromagnetic wave is a transverse wave. therefore, the EM wave is a Transverse wave 
(c) true .
The Electromagnetic wave consists of the two mutually perpendicular electric and magnetic fields  and also both fields are  perpendicular to the direction of propagation of the wave. 
(d) true .
An electromagnetic wave  carry  energy through  vacuum with a speed   of  
  
    so , all of the above are true.
 
        
             
        
        
        
Answer:
The box will be moving at 0.45m/s. The solution to this problem requires the knowledge and application of newtons second law of motion and the knowledge of linear motion. The vertical component of the force Fp acts vertically upwards against the directio of motion. This causes a constant upward force of 23sin45° to act on the box. Fhe frictional force of 13N also acts vertically upwards and so two forces act upwards against rhe force of gravity resulting un a net force of 0.7N acting kn the box. This corresponds to an acceleration of 0.225m/s². So in w.0s after i start to push v = 0.45m/s.
Explanation:
 
        
                    
             
        
        
        
<span>Assuming the car is travelling in the same direction for the entire hour, the acceleration is zero.</span>