A biker travels at an average speed of 18 km/h along a 0.30-km straight segment of a bike path. How much time ( in hours)does the biker take to travel this segment?

Which transition by an electron will release the greatest amount of energy? oa ob oc od

Give one example to show that when substances are mixed,it may result in a chemical or a physical change depending on the conditions.

Consider an ideal gas at 27.0 degrees celsius and 1.00 atmosphere pressure. imagine the molecules to be uniformly spaced, with each molecule at the center of a small cube. what is the length l of an edge of each small cube if adjacent cubes touch but don't overlap?