Determine the acceleration of a rocket.

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Homework Help Overview

The problem involves determining the acceleration of a rocket during its ascent phase, which lasts for 30 seconds, followed by a free-fall phase. The total flight time is specified as 300 seconds, and the goal is to find the necessary acceleration for the rocket to ensure its equipment survives the flight. Participants are discussing the implications of the rocket's motion, including the effects of gravity and the transition between phases.

Discussion Character

  • Mixed

Approaches and Questions Raised

  • Participants are exploring the relationship between the rocket's acceleration and its velocity at different phases of flight. There are discussions about the equations of motion and how to apply them to both the ascent and free-fall phases. Questions about the initial conditions and the effects of gravity are also raised.

Discussion Status

The discussion is ongoing, with various participants attempting to clarify the equations and assumptions involved in the problem. Some have suggested different interpretations of the rocket's motion, particularly regarding the effects of gravity during the ascent phase. There is a recognition of the complexity involved in transitioning between the two phases of flight.

Contextual Notes

Participants are grappling with the implications of the rocket's acceleration and the effects of gravity during both phases of flight. There is some confusion regarding the timing of the transition from powered ascent to free fall, as well as the initial conditions for the equations being used.

  • #31
oh my bad then
i thought for calculation purposes only they wanted u to assume tohe rocket fell aft fuel ran out
thanks for clearing up the free fall term for me
 
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  • #32
roovid said:
oh my bad then
i thought for calculation purposes only they wanted u to assume tohe rocket fell aft fuel ran out
thanks for clearing up the free fall term for me

How can a rocket change its velocity to zero in no time, without fuel? :biggrin: Even the problem maker can not assume nonsense...

ehild
 
  • #33
lol i kno
but some of the question i am doing are makin me assume some weird stuff
for basic calculation purposes
sorry.my error
thnx fr the correction again
 
  • #34
You are welcome. :smile:

ehild
 
  • #35
So a = 176 ms^2?
 
  • #36
Squizzel said:
So a = 176 ms^2?

No. How did you get it?

ehild
 
  • #37
Nm I did a calculation error. I now did 0 = 450a + 30a(270) - 1/2 (9.81)(270)^2 = 70 ms-2
 
  • #38
How can be 0=70 m/s2? Solve the equation for a.

ehild
 
  • #39
I didn't do the long work in that message, but that's what it came out to I brought the 1/2 x 9.81 x 270 squared to the other side and then divded by 450 + 30 x 270
 
  • #40
Squizzel said:
I didn't do the long work in that message, but that's what it came out to I brought the 1/2 x 9.81 x 270 squared to the other side and then divded by 450 + 30 x 270

That is not 70. 1/2 x 9.81 x 2702 =357574.5
450 + 30 x 270=8550

357574.5/8550=?

ehild
 

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