أتمنـــــىتســـاعدوني
 

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هذا السؤال:
A 145-Kg (including all the contents) rocket has an engine that produces a constant vertical force (the thrust) of 1700N . Inside this rocket, a 18.6-N electrical power supply rests on the floor.
Find the acceleration of the rocket.
When it has reached an altitude of 120m , how hard does the floor push on the power supply? (Hint: Start with a free-body diagram for the power supply.)
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رد: أتمنـــــىتســـاعدوني
 

بليـــــــــــــــــز بسرعة

M = 145 kg F = 1700 N w = 18.6 N

M *a = F - W

a = F-W/M

W = M*g = 145*9.81 = 1422 N

a = 1700 - 1422 / 145

a = 1.92 m/s^2

R = m * a + w
or
R = m *( g + a

m = w / g

m = 18.6/9.81=1.9 kg

R = 1.9 *( 1.92 + 9.81

R = 22 N