Today Puzzle #605
Puzzle No. 605鈥� Wednesday 6 November
Today is ‘This is Engineering Day’, so today’s puzzle is an engineering one. A parent has purchased a vertical loop the loop track for a toy car. Assuming the track and car are frictionless, how much higher than the top of the loop the loop must the car start in order for it to go round without falling off?
Today’s #PuzzleForToday has been set by Dr Shaun Fitzgerald, Director of the Royal Institution and Dr Hugh Hunt, Reader in Engineering at Cambridge University.
Click here for the answer
Total height needed is 2.5 times the radius, so the car needs to start 0.5 radii above the top of the loop the loop.
-
![]()
Puzzle for Today 鈥� Index
Find all of the currently available Puzzles for Today, with answers.
More fiendish brain-teasers and quizzes on 大象传媒 Radio...
-
![]()
From autumn leaves to the magic roundabout: test yourself with our favourite quizzes.
-
![]()
We asked the intelligence agency to set our listeners a code-cracking challenge... Can you solve it?
-
![]()
Quiz: How many of these Mastermind music questions can you answer?
Here's a chance to find out whether your specialist subject on Mastermind could be the entire history of music.
-
![]()
Six conundrums to grapple with, including the Riddle of the Sphinx. Try not to forfeit your life...
