Engineering Mechanics: Statics & Dynamics (14th Edition)

Published by Pearson
ISBN 10: 0133915425
ISBN 13: 978-0-13391-542-6

Chapter 15 - Kinetics of a Particle: Impulse and Momentum - Section 15.9 - Propulsion with Variable Mass - Problems - Page 310: 137



Work Step by Step

We know that: $\Sigma F=m\frac{dm}{dt}+v_{D/i} \frac{dm_i}{dt}$ $\implies R-w(vt)=(0-v(\frac{wv}{g}))$ $\implies R=wv(t-\frac{v}{g})$ We plug in the known values to obtain: $R=5(4)(5-\frac{4}{32.2})$ This simplifies to: $R=(20t+2.48)lb$
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