they have more energy than radio waves.
&
because the wavelength of the light waves are too small
 
        
             
        
        
        
Answer:
80%
Explanation:
Efficiency = Power output / Power input × 100 %
 To calculate efficiency we need to find power output of electric pump.
We can use,
Work done = Energy change
Work done per second = Energy change per second
Work done per second = Power
Therefore, Power = Energy change per second
                               = Change in potential energy of water per second
                               =mgh / t
                               = 200× 10×6 / 10
                               = 1200 W = 1.2 kW
Now use the first equation to find efficiency,
Efficiency =  × 100%
 × 100%
                 = 80 %
 
        
             
        
        
        
A) An electrical resistor  
Hope that helps, Good luck! (:
        
             
        
        
        
Since we are only looking at the vertical height, we can use the free fall equation to find the height:
h = 0.5*g*t^2, where h is height in m, g is acceleration due to gravity (9.81 m/s^2), and t is time in seconds
h = 0.5*(9.81 m/s^2)*(3.7 s)^2
h = 67.15 m
Therefore, the 7th floor window is 67.15 m above ground level.
        
             
        
        
        
Calculate velocity at halfway to the ground.
vfinal = root 2ad
v = root (2*9.81m/s^2*25)
v = 69.367175234 m/s
Kinetic energy = 1/2mv^2
Kinetic energy = 1/2 * (69.367175234 m/s^s^2
Ek = 2405.9025 Joules