Answer to Question #290843 in Molecular Physics | Thermodynamics for eysiii

Question

A 700 lbm rocket is accelerated at a rate of 20 ft/s2. What total force is required in lbf

if: a) the rocket is moving horizontally and without friction, b) the rocket is moving

vertically upward in a location where g = 31 ft/s2.

Answer 1

a)

$F_1=ma=14 ~klbf,$

b)

$F_2=m(g+a)=35.7~klbf.$