James Bond is unconscious in a 1000kg car full of explosive on a very dangerous road. After starting from rest at the top of the hill (point A), the car reaches the flat (horizontal) part of the road. At the beginning of the flat(horizontal) part, Bond regains the consciousness and applies brakes. The car skids across the horizontal road while slowing. The car, full of explosive, stops just as it reaches the far edge of the 50 m flat (horizontal) part of the road. What constant breaking force would have to be applied for the car to make a safe stop in a horizontal distance of 50 m?

F = 19600 N

Explanation:

After reading this interesting exercise, I think you are missing the diagram, but we are going to solve them assuming the height of the hill, point A of about h = 100m.

Let's start by using the concepts of energy, to find the speed at the bottom of the hill

Starting point. Point A highest part of the colima

         Em₀ = U = m g h

Final point. Flat part.

          = k = ½ m v²

as they tell us that there is no friction, energy is conserved

        Em₀ = Em_{f}

        mgh = ½ m v²

        v = √2gh

let's calculate

        v = √ (2 9.8 100)

         v = 44.27 m / s

Now we can use the scientific expressions, when it stops its speed is zero

         v² = v₀² - 2 a x

          0 = v₀² - 2ax

          a =

          a =

          a = 19.6 m / s²

with this acceleration we use Newton's second law

           f = m a

           F = 1000 19.6

           F = 19600 N

it takes about 30 days for it to break down

answer: the exterior temperature of commercial jet planes as they leave the stratosphere and return to the ground increases steadily.

explanation:

the lower most layer of atmosphere is troposphere which extends from 0 to 12 km above the surface of the earth. the temperature initially decreases as distance is increased from the earth's surface. commercial jets fly in lower part of the stratosphere. the stratosphere extends upto 50 km. the temperature in stratosphere starts rising again due to presence of ozone which traps the uv rays.

thus, when the planes leave the stratosphere and return to the ground, the exterior temperature increases steadily.