Gizmo Warm-up: Lifting a piano A pulley is a simple machine that is used to lift heavy objects. A pulley
is a wheel with a groove for a rope. Pulling down on one end of the
rope causes the other end to pull up.
1. In the Object to lift menu choose Piano. What is the weight of the
piano? This is the load on the pulley.
1111 HII VIDEO
Piano weight:
newtons (N).

Answerthe half-reaction having the greatest tendency to occur at the anode:     i₂(aq) + 2e⁻  ⇄ 2i⁻  ;   e = +0.53 v======oxidation occurs at the anode. we must therefore find the half-reaction with the greatest tendency to oxidize.the given values of e are reduction potentials (the form of the half-reactions are of reduction).the lower the reduction potential, the higher the potential to oxidize. the half-cell with the lowest reduction potential will have the greatest tendency to oxidize at the anode.the half-reaction having the greatest tendency must be    i₂(aq) + 2e⁻  ⇄ 2i⁻    e = +0.53 vbecause its reduction potential is the lowest out of the three.

Asmall proportion of helium in the crust is helium that was trapped in the earth when the earth formed and has not yet escaped. most helium on earth, however, forms as a result of alpha decay of uranium and thorium. the emitted alpha particles, once they grab a couple of stray electrons, become helium atoms and can accumulate in gas reservoirs along with things such as methane.