Answer:
The rate of change of the distance between the helicopter and yourself (in ft/s) after 5 s is  ft/ sec
 ft/ sec
Explanation: 
Given:
h(t) =  25 ft/sec
x(t) = 10 ft/ sec
h(5) = 25 ft/sec . 5 = 125 ft
x(5) = 10 ft/sec . 5 = 50 ft
Now we can calculate the distance between the person and the helicopter by using the Pythagorean theorem

Lets find the derivative of distance with respect to time 

Substituting the values of h(t) and  x(t) and simplifying we get,



 =
  =  =
  =  ft / sec
 ft / sec
 
        
             
        
        
        
Answer:
UV light is more powerful as it has greater energy. 
Explanation:
The energy propagated by electromagnetic waves ( light ) through vacuum or medium is known as electromagnetic radiation. 
The frequency/wavelength range of electromagnetic radiation is known as electromagnetic spectrum. The electromagnetic spectrum ranging from gamma ray to radio waves.
Frequency range of UV light = ( 8 x 10¹⁴ to 3 x 10¹⁶ ) Hz
Frequency range of Microwaves = ( 300 x 10⁶ to 300 x 10⁹ ) Hz
Ratio of UV light to Microwaves = ( to
 to  )
 )
                                                      = ( 2.66 x 10⁶ to 1 x 10⁸ )
Energy of electromagnetic radiation is given by the relation:
E = hν
Here h is plank's constant and ν is frequency.
UV light is more powerful than Microwaves as frequency of UV light is greater than frequency of microwaves. Thus, by the above equation, the energy of UV light is more than energy of Microwaves.  
 
        
             
        
        
        
<span>There's nothing on that list that may be damaged by increase in solar activity.
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