Is jewelry gold a compound or mixture?

What tightening torque should be used for a hexagonal head screw (not split-bolt) on a 250 kcmil conductor?

Which lists the organs in the correct order as food passes from the mouth to anus?

Afisherman notices that his boat is moving up and down periodically without any horizontal motion, owing to waves on the surface of the water. it takes a time of 2.20 s for the boat to travel from its highest point to its lowest, a total distance of 0.670 m . the fisherman sees that the wave crests are spaced a horizontal distance of 5.80 m apart. (a) how much is the wavelength? (b) find the period of the wave. (c) how fast are the waves traveling? (d) what is the amplitude a of each wave?