A small airplane flying horizontally with a speed of 129 mi/hr at an altitude of 260 ft above a remote valley drops an emergency medical package at A. The package has a parachute which deploys at B and allows the package to descend vertically at the constant rate of 5.9 ft/sec. If the drop is designed so that the package is to reach the ground 24 seconds after release at A, determine the horizontal lead L so that the package hits the target. Neglect atmospheric resistance from A to B. B Target- L 129 mi/hr Al 260'

A small airplane flying horizontally with a speed of 129 mi/hr at an altitude of 260 ft above a remote valley drops an emergency medical package at A. The package has a parachute which deploys at B and allows the package to descend vertically at the constant rate of 5.9 ft/sec. If the drop is designed so that the package is to reach the ground 24 seconds after release at A, determine the horizontal lead L so that the package hits the target. Neglect atmospheric resistance from A to B. B Target- L 129 mi/hr Al 260'

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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Analysis and Procedures for Material Selection

The term material selection means to select the right material for various engineering applications. There are various engineering materials available and each has different individual properties. Thorough knowledge of the material properties and behavior is crucial in the design process. For instance, a structural member, such as a beam, is used to support vertical shear loads by the building itself. To withstand such loads, the material of the beam must possess adequate strength and stiffness to resist any deformation that might lead to the formation of cracks.

Question

A small airplane flying horizontally with a speed of 129 mi/hr at an altitude of 260 ft above a remote valley drops an emergency
medical package at A. The package has a parachute which deploys at B and allows the package to descend vertically at the constant
rate of 5.9 ft/sec. If the drop is designed so that the package is to reach the ground 24 seconds after release at A, determine the
horizontal lead L so that the package hits the target. Neglect atmospheric resistance from A to B.
B
Target-
L
129 mi/hr
Al
260'

Calculate the time t₁ at which the parachute opens.
B
Target-
Answer: t₁ = i
L-
sec
129 mi/hr
Al
260'

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* Incorrect
Calculate the time t₁ at which the parachute opens.
B.
Target-
Answer: t₁ = i 3.84
L
sec
129 mi/hr
Al

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