The Laerdal Tunnel in Norway is the world’s longest tunnel. It is 24.4 km long. An engineer plans to make a scale model of the tunnel using the scale 3 cm : 4 km. What will the length of the model be?

Answer

The model length of the tunnel will be 18.3 cm.

Step-by-step explanation:

Given:

The Laerdal Tunnel in Norway is the world’s longest tunnel. It is 24.4 km long. An engineer plans to make a scale model of the tunnel using the scale 3 cm : 4 km.

Now, to find the length of the tunnel of the model.

Let the model length of the tunnel be

The actual length of the tunnel is 24.4 km.

The scale model of the engineer is 3 cm : 4 km.

If, 3 is equivalent to 4.

Thus, is equivalent to 24.4.

Now, by using cross multiplication method we get the model length of the tunnel:

By cross multiplying we get:

Dividing both sides by 4 we get:

Therefore, the model length of the tunnel will be 18.3 cm.

step-by-step explanation: a reaction is first order. if the initial reactant concentration is 0.0200 m, and 25.0 days later the concentration is 6.25 x 10-4 m, then its half-life is:

c. y = 1/4 x + 5

step-by-step explanation:

first, put the equation of the line on the graph into slope-intercept form

(y = mx + b):   y = -4x + 8

second, a perpendicular line has to have "an opposite/reciprocal slope" to the original slope. so, find the "m" value in your original equation (it's -4, right? )

original slope: m = -4   perpendicular slope: change the sign to its opposite and find the reciprocal ("flip" the number)

new slope is now positive (b/c the original slope was negative 4), and it's 1/4 (not the original slope of 4 or 4/1)