A5-meter uniform plank of mass 100 kilograms rests on the top of a building with 2 meters extended over the edge as shown above. how far can a 50-kilogram person venture past the edge of the building on the plank before the plank just begins to tip?

The first-order reaction a→2b+c has rate constant 0.538 s−1. if the initial concentration of a is 0.867 mol l−1, what is the half-life of the reaction in seconds? remember to use correct significant figures in your answer (round your answer to the nearest hundredth). do not include units in your response.