A uniform plank of 5 m is rested across the banks of a stream the plank weighs 50 N how far from the center would the weight appear to act

11. you want to calculate the displacement of an object thrown over a bridge. using -10 m/s2 for acceleration due to gravity, what would be the total displacement of the object if it took 8 seconds before hitting the water?

A248-g piece of copper is dropped into 390 ml of water at 22.6 °c. the final temperature of the water was measured as 39.9 °c. calculate the initial temperature of the piece of copper. assume that all heat transfer occurs between the copper and the water. remember, the density of water is 1.0 g/m

Achlorine atom has 17 protons and 18 neutrons. what is its mass number? what is its atomic number?