Dot Point Physics, discrepancies with answers... (1 Viewer)

[ohexploitable]

HAHAHA DISREGARD THAT, I SUCK COCKSa

 

[ultraman8]

It would appear so yes.

 

[smik11]

i got 2.2 for part a

i think the mass is just 30000 not 30000 + 25000

 

[ohexploitable]

i got 2.2 for part a

i think the mass is just 30000 not 30000 + 25000

I used just 30000

F=ma
360000=30000a
a=12

 

[smik11]

dont you use the thing : a = T - mg / m

because the 'F' is the thrust minus the weight force

 

[ohexploitable]

Oh... I was never taught that...

 

[ohexploitable]

So,

F=ma
360000-9.8*30000=30000a
a=2.2

 

[smik11]

yes

lol i have no idea about the other 2 questions.

 

[tjhunt11]

HAHAHA DISREGARD THAT, I SUCK COCKSa

too much info there matey!!! hahaha xD

 

[s2 SEductive]

yes

lol i have no idea about the other 2 questions.

a) a= t -mg / m
a = 360000 - ( 9.8 x 30000) / 30000
a = 2.2 m/s/s

b) The rockets mass is 30000kg In which 25000kg is its fuel. The fuel will be used up to increase its acceleration.
Therefore, 30000 - 25000 = 5000kg
a= t -mg / m
a = 360000 - ( 9.8 x 5000) / 5000
a = 62.2 m/s/s

c) g force formula : g+a /g
g force = 62.2 + 9.8 /9.8
= 7.35g