B) The velocity of a car reduced from 50 km/h to 35 km/h over one minute
        
                    
             
        
        
        
La longitud del faldón de la rampa es de 5.4 m.
   
La pendiente expresada en porcentaje sigue la siguiente ecuación:
 (1)
 (1)
Donde:
- y es la elevacion de la rampa (faldón)
- x es la longitud de la ramapa (20 m)
Sabemos que la pendiente es de 27%. Por lo tanto, usando la ecuación 1, despejamos y.


 
         
 
La longitud del faldón es 5.4 m
Pudes ver más sobre el tema aquí:
brainly.com/question/8906330
 
        
             
        
        
        
Answer:
8.80 Hz
Explanation:
The frequency of a loaded spring is given by

where k and m are the spring constant and the mass of the load respectively. The values of these do not change because they are internal properties of the components of the system.
Hence, the frequency of the vertical spring mass does not change and is 8.80 Hz.
On the other hand, the frequency of the simple pendulum is affected because it is given by

where g and l are acceleration due to gravity and length of the pendulum, respectively. It is thus seen that it depends on g, which changes with location. In fact, the new frequency is given by

 
        
             
        
        
        
Answer:
m = 0.0125 kg
Explanation:
Let us apply the formula for the speed of a wave on a string that is under tension:

where F = tension force
μ = mass per unit length
Mass per unit length is given as:
μ  = m / l
where m = mass of the string
l = length of the string
This implies that:

Let us make mass, m, the subject of the formula:

From the question:
F = 20 N
l = 4.50 m 
v = 85 m/s
Therefore:
