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

For a research project, a student decided to test the effect of the lead(ii) ion (pb2+) on the ability of salmon eggs to hatch. this ion was obtainable from the water‐soluble salt, lead(ii) nitrate, which the student decided to make by the following reaction. pbo(s) + 2 hno3(aq) → pb(no3)2(aq) + h2o losses of product for various reasons were expected, and a yield of 86.0% was expected. in order to have 5.00 g of product at this yield, how many grams of pbo should be reacted? (assume that sufficient nitric acid, hno3, would be used.)