An experimental rocket sled weighs 5900 Ib and is propelled by six rocket motors each with an impulse rating of 8300 Ib-sec. The rockets are fired one after the other at 1.1-sec intervals, and the duration of each rocket fıring is 2.4 sec. If the velocity of the sled 9.6 sec from the start is 172 mi/hr, determine the time average R of the total aerodynamic and mechanical resistance to motion. Neglect the loss of mass due to exhausted fuel compared with the mass of the sled. Rocket thrust Answer: R = i Ib

An experimental rocket sled weighs 5900 Ib and is propelled by six rocket motors each with an impulse rating of 8300 Ib-sec. The rockets are fired one after the other at 1.1-sec intervals, and the duration of each rocket fıring is 2.4 sec. If the velocity of the sled 9.6 sec from the start is 172 mi/hr, determine the time average R of the total aerodynamic and mechanical resistance to motion. Neglect the loss of mass due to exhausted fuel compared with the mass of the sled. Rocket thrust Answer: R = i Ib

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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Question

An experimental rocket sled weighs 5900 Ib and is propelled by six rocket motors each with an impulse rating of 8300 Ib-sec. The
rockets are fired one after the other at 1.1-sec intervals, and the duration of each rocket fıring is 2.4 sec. If the velocity of the sled 9.6
sec from the start is 172 mi/hr, determine the time average R of the total aerodynamic and mechanical resistance to motion. Neglect
the loss of mass due to exhausted fuel compared with the mass of the sled.
Rocket
thrust
Answer: R = i
Ib

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