Take the JETS Challenge and Win Prizes!
This Week's Challenge Last Week's Challenge Challenge Archive
The JETS Challenge is a weekly word problem posted each Friday during the academic year. Students can submit answers individually, teachers can use the Challenge in the classroom, or engineering clubs can use the Challenge as a team building exercise. How you use the JETS Challenge is up to you.
Win Prizes!
Submit your answer to the JETS Challenge each week (before the next challenge is posted) and all correct submissions will be entered into a monthly drawing to receive a free copy of the new JETS ASSESS and Explore (JETS printed career brochure about engineering careers). There will be five winners each month.
This Month’s Winners
Congratulations to this month’s winners for their outstanding work. A copy of JETS Assess and Explore will be sent to each of them.
William Hannah
Henry Shull
Jordan DuPaul
Alexander Ruff
Justin Cox
Submitting Answers to JETS
E-mail your answer to JETS at challenge@jets.org and enter 'Challenge xx' in the subject line. NOTE: Only those submissions with 'Challenge 84' (enter the actual week's challenge number) in the subject line will be considered for the monthly drawing.
The Solutions
Each Friday, the previous week's solution will be posted.
A special thanks to Dave Meredith, Associate Professor at the Penn State University-Fayette for providing these questions to JETS.
This Week's Challenge:
Challenge 103—The Stop-Light Challenge
Wire expands as it warms up by the formula
x = L·a·DT
where x is the increase in length
in feet, L is the length of the wire, a is the
thermal coefficient of expansion and DT is the temperature
change in °F.
The thermal coefficient of expansion for steel wire is 9.9x10-6 feet
per foot of length per °F.
If a 0.8 in diameter wire
between two poles spaced 140 feet apart supports a traffic light in the center
and is very tight when the winter temperature is –15°F, how many inches lower
will the light be mounted on a hot 95 °F day?
Last Week's Challenge:
Challenge 102 —The Jail House Rock Challenge
The answer is 187.6 km.
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