A 40 kg man stands atop a 10 m ladder with a mass of 15 kg leaning
against the wall. If the ladder is in static equilibrium, what must be the
normal force from the ground, assuming the wall is frictionless?

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.