5. What happens to the gravitational and kinetic energy in a pendulum as it swings back and forth?
As it falls the GE converts to KE and as it rises, the KE converts to GE,
As it falls the KE converts to GE and as it rises, the GE converts to KE.
O As it falls the GE transfers to KE and as it rises, the KE transfers to GE.
O As it falls the KE transfers to GE and as it rises, the GE transfers to KE.

Tooth enamel consists mainly of the mineral calcium hydroxyapatite, ca_10(po_4)_6(oh)_2. trace elements in teeth of archaeological specimens provide anthropologist with clues about diet and diseases of ancient people. students at hamline university measured strontium in enamel from extracted wisdom teeth by atomic absorption spectroscopy. solutions with a constant total volume of 10.0 ml contained 0.726 mg of dissolved tooth enamel plus variable concentrations of added sr. added sr find the concentration of sr in the 10 ml sample solution in parts per billion = ng/ml. find the concentration of sr in tooth enamel in parts per million = mu g/g.