Silly rocket question

by Bella
(ACT)

The question about the rocket:


6.) A rocket engine that takes off from earth burns 10,000 pounds of fuel in 15 minutes, and is able to lift 20,000 pounds total for that time period (including the rocket fuel itself). If a payload that weighs 20,000 pounds is needed to be transported for one hour, and unused rocket engines are dropped in stages after their fuel has been exhausted, how many rocket engines must be used to transport the payload for that time period?

Is so confusing and does not make any logical sense!!!

Fix this question!!!

Thank you

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Huh?
by: Anonymous

I figured it at 4 engines 1 engine is good for 15 minutes. 15 min. x 4 = 60 min/1 hour.

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Rockets, shrockets
by: Anonymous

I think you're all off your rockets !!

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Still doesn't make sense
by: Anonymous

How much does each rocket engine weigh? Are we to assume the rocket engines are weightless -- that is the only way to solve the problem and is not very realistic.

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Now it makes sense
by: Bella

Thanks for clearing that up. I was too confused about all the rockets etc.


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Logic
by: iStryker

Logic:
Stage 4:
20,000lb = 0,000 thrust (payload)
10,000lb = 20,000 thrust (rocket 1)
10,000lb = 20,000 thrust (rocket 2)
=
40,000lb = 40,000 of thrust

Stage 3:
40,000lb = 0,000 thrust (payload + 2 rockets)
10,000lb = 20,000 thrust (rocket 3)
10,000lb = 20,000 thrust (rocket 4)
10,000lb = 20,000 thrust (rocket 5)
10,000lb = 20,000 thrust (rocket 6)
=
80,000 = 80,000 of thrust

Stage 2:
80,000 = 0,000 of thrust (payload + 6 rockets)
8x(10,000lb) = 160,000 of thrust (8 more rockets)
=
160,000lb = 160,000 of thrust

Stage 1:
160,000 = 0,000 of thrust (payload + 14 rockets)
16x(10,000) = 320,000 of thrust (16 more rockets)
=
320,000lb = 320,000 of thrust
=
30 rockets

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