Question 155(i)
What happens when 1 cm worms are sent through these hook-ups?
If 1 cm worms are sent through (×21) and (×2−1) machine, then the result comes with 1×2×12=1cm.
Question 155(ii)
Question 148(ii)
Two machines can be hooked together. When something is sent through this hook up, the output from the first machine becomes the input for the second. Which stretching machine does the same work as two (×2) kmachines hooked together?