Register to reply

Projectile Motion problem with Plane dropping package

by Knights18
Tags: package, projectile, projectile problem
Share this thread:
Knights18
#1
Feb10-12, 12:25 AM
P: 1
1. The problem statement, all variables and given/known data

An airplane with a speed of 45.2 m/s is climbing upward at an angle of 40░ with respect to the horizontal. When the plane's altitude is 540 m, the pilot releases a package.
(a) Calculate the distance along the ground, measured from a point directly beneath the point of release, to where the package hits the earth.

(b) Relative to the ground determine the angle of the velocity vector of the package just before impact. (clockwise from the positive x axis)

We know the initial velocity for the X and Y components, the height at which the plane drops the package and the angle at which the plane is ascending in respect to the horizontal.

2. Relevant equations

Delta Y = 1/2(a)t^2
V= Vi + at
X = Vt

3. The attempt at a solution

I found the total time it would take for the package to hit the ground from the time that it was released to be Sqrt(Y/g) = Sqrt(540/9.8) = 10.5 seconds. But, the package has an initial velocity in the Y direction so I thought to use the Y velocity component (45.2sin40) divided by the acceleration to find the additional time that the entire flight would take because right after the plane releases the package, the package travels a certain distance upwards due to the velocity, and then proceeds to travel in the downward direction. I understand that concept, but after that, I have no idea where to go form here.

PLEASE HELP!! I have my College Physics Midterm due by Sunday Night! This is one of the practice problems and I don't understand this concept and I just KNOW my teacher, there will be one of these on the midterm. Thank you everyone :)
Phys.Org News Partner Science news on Phys.org
New model helps explain how provisions promote or reduce wildlife disease
Stress can make hard-working mongooses less likely to help in the future
Grammatical habits in written English reveal linguistic features of non-native speakers' languages
TaxOnFear
#2
Feb10-12, 01:39 AM
P: 92
Welcome to PF.
Have you heard of the 4 constant acceleration questions? As this is freefall, acceleration (g) is constant, therefore that's the route I'd go down.
NascentOxygen
#3
Feb10-12, 06:13 AM
HW Helper
Thanks
P: 5,137
Quote Quote by Knights18 View Post
Delta Y = 1/2(a)t^2
In the y direction, motion is completely described by s = ut + Żat^2
so why not use that?


Register to reply

Related Discussions
Projectile Motion on a Inclined Plane Problem Introductory Physics Homework 1
Projectile Motion, package has to land on a moving ship after being droped from plane Introductory Physics Homework 14
Plane drops package; superman on ground flys at angle then horizontal to meet package Introductory Physics Homework 1
Motion in a Plane (Graphing Projectile Motion) Introductory Physics Homework 4
Projectile Motion/Dropping an object from the sky Introductory Physics Homework 8