- #1

lawliet

- 6

- 1

- Homework Statement:
- so basically, i need to drop a package from a moving plane so that it lands at a given location. the package has a parachute attached to it which opens as soon as it is dropped from the plane. so i need to figure out how much distance before the drop location i need to release the package, taking into account air resistance (drag). im having trouble because of the air resistance part, which is usually neglected in most problems.

- Relevant Equations:
- drag force = Cd * .5 * r * V^2 * A

**Homework Statement::**so basically, i need to drop a package from a moving plane so that it lands at a given location. the package has a parachute attached to it which opens as soon as it is dropped from the plane. so i need to figure out how much distance before the drop location i need to release the package, taking into account air resistance (drag). I am having trouble because of the air resistance part, which is usually neglected in most problems.

**Homework Equations::**drag force = Cd * .5 * r * V^2 * A

so i have a fair idea on what factors i need to consider but i have problem putting them all together.

i know the drag force formula. and i can find the terminal velocity by equating this formula with the weight of the package.

so , v = sqrt((mg * 2)/r*cd*A))

i also know that we can calculate how far the package will land if we ignore the parachute part, which is, using projectile equations.

but i don't know how to proceed further. how do i combine the parachute part with the package part?

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