Elasticity-Old is Gold

  1. A rigid, lighter than air balloonfilled with Helium cannot continue to rise indefinitely. Why?
  2. Why bridges are declared unsafeafter a long use?
  3. Explain which one is more elastic-rubber or steel.
  4. Why are rubbers used as vibration absorbers?
  5. Differentiate between elasticity and plasticity.
  6. Two wires A and B have equal lengths and are made of same material. If the diameter of wire A is twice that of wire B, which wire has the greater extension for a given load?
  7. Explain in terms of breaking stress, why elephant has thicker legs as compared to human beings?