13. Which situation will produce the greatest change of momentum for a 1.0-kilogram cart?
A) accelerating it from rest to 3.0 m/s
B) accelerating it from 2.0 m/s to 4.0 m/s
C) applying a net force of 5.0 N for 2.0 s
D) applying a net force of 10.0 N for 0.5 s
Answer Here:

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.