Matthew is waterskiing. as the boat starts moving, he is at an angle of 8.0° to the right of the boat. the boat applies 250 newtons over the first 50 meters, while the angle stays at roughly 8.0°. what work has the boat done on matthew?

a.1.0 × 104 joules
b.1.2 × 104 joules
c.1.4 × 104 joules
d.1.7 × 104 joules

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.

Can anyone answer these questions? ? i need it before 1: 00pm today

Charles's law describes the relationship of the volume and temperature of gas at a constant mass and pressure. according to this law, what would happen to the temperature of the gas if its volume decreased from 1.0 l to 0.50 l?