# Silly rocket question

by Bella
(ACT)

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

### Comments for Silly rocket question

Average Rating

 Rating Huh? by: Anonymous I figured it at 4 engines 1 engine is good for 15 minutes. 15 min. x 4 = 60 min/1 hour.

 Rating Rockets, shrockets by: Anonymous I think you're all off your rockets !!

 Rating 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.

 Rating Now it makes sense by: Bella Thanks for clearing that up. I was too confused about all the rockets etc.

 Rating 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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