Answer:
The correct answer is b,  x = 9 cos (pi / 2 t)
Explanation:
The equation that describes a simple pendulum is
              θ  = θ₀  cos (wt + φ)
The angle is measured is radians
             θ = x / L
 
We replace
            d / L = x₀ / L cos (wt + φ)
             x₀ = 9 in
          
 We replace
              d = 9 cos (wt + φ)
Angular velocity is related to frequency and period.
            w = 2π f = 2π / T
The period is the time of a complete oscillation T = 4 s
            w =2π / 4
            w = π / 2
Let's replace
              x = 9 cos (π/2 t + φ)
As the system is released from the root x = x₀ for t = 0 s
               x₀ = x₀ cos φ
              Cos φ = 1
              φ = 0°
The final equation is
              x = 9 cos (pi / 2 t)
The correct answer is b
 
        
                    
             
        
        
        
Kinetic energy<span> increases with the square of the velocity (KE=1/2*m*v^2). If the velocity is doubled, the KE quadruples. Therefore, the </span>stopping distance<span> should increase by a factor of four, assuming that the driver is </span>can<span> apply the brakes with sufficient precision to almost lock the brakes.</span>
        
             
        
        
        
You are correct it is translucent because opaque let’s no light through but transparent lets almost all light through
        
             
        
        
        
There doesn't seem to be any direct connection.
        
             
        
        
        
Answer:
35.14°C
Explanation:
The equation for linear thermal expansion is  , which means that a bar of length
, which means that a bar of length  with a thermal expansion coefficient
 with a thermal expansion coefficient  under a temperature variation
 under a temperature variation  will experiment a length variation
 will experiment a length variation  .
.
We have then  = 0.481 foot,
 = 0.481 foot,  = 1671 feet and
 = 1671 feet and  = 0.000013 per centigrade degree (this is just the linear thermal expansion of steel that you must find in a table), which means from the equation for linear thermal expansion that we have a
 = 0.000013 per centigrade degree (this is just the linear thermal expansion of steel that you must find in a table), which means from the equation for linear thermal expansion that we have a  = 22.14°. As said before, these degrees are centigrades (Celsius or Kelvin, it does not matter since it is only a variation), and the foot units cancel on the equation, showing no further conversion was needed.
 = 22.14°. As said before, these degrees are centigrades (Celsius or Kelvin, it does not matter since it is only a variation), and the foot units cancel on the equation, showing no further conversion was needed.
Since our temperature on a cool spring day was 13.0°C, our new temperature must be  = 35.14°C
 = 35.14°C