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

Comments for Silly rocket question

Average Rating starstarstarstar

Click here to add your own comments

Rating
starstarstarstarstar
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
starstarstarstarstar
Rockets, shrockets
by: Anonymous

I think you're all off your rockets !!

Rating
star
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
starstarstarstarstar
Now it makes sense
by: Bella

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


Rating
starstarstarstarstar
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

Click here to add your own comments

Join in and write your own page! It's easy to do. How? Simply click here to return to views.

Recent Articles

  1. People lie about their IQ

    Oct 30, 18 04:18 PM

    When I was in college taking a statistics course, the professor began by discussing IQ distributions. He asked people in the class to raise their hand

    Read More

  2. Your math is flawed

    Jul 31, 18 03:24 PM

    According to your chart: 95% of IQ scores fall between 70 and 130 Which means that 5% of the population is distributed in either scores below 70 or above

    Read More

  3. Police Aptitude Test

    Jul 15, 18 02:24 PM

    Police Aptitude Test measures your aptitude for police jobs by offering police daily working situations.

    Read More