Did you manage to crack the code?
Did you manage to crack the code?

This year's competition is now closed: thanks for playing!

Log in to your Materials Today member's account to see the answers. We'll be announcing the winner of the iPad Air shortly.

Lock 1

  • Avogadro's number (to 4 significant figures) is a x 1020
  • The sum of the atomic numbers of Sulphur, Tellurium, Tungsten, Argon, Terbium, Lanthanum and Neodymium is b.
  • The charge on an electron (to 4 significant figures) is c × 10-22 C

Lock 1 combination = a + b + c

Lock 2

  • The coefficient of linear expansion of aluminium is 24 × 10-6 K-1. At 10 °C an aluminium rod is exactly 30 cm long. At 30°C the rod has increased in length by x µm.
  • A current of 0.8 A passes through a metal wire of resistance 90 ? for 1 minute. y Joules of energy are released.
  • A 500 kg container is placed on a surface. The coefficient of static friction between the surfaces is 0.4 and g = 9.81 ms-2. The magnitude of the force required to start sliding the box is z N.

Lock 2 combination = x + y + z

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