What is the limiting reactants? How many other substances would remain?

Naoki's bicycle has a mass of 10 kg. if naoki sits on her bicycle and starts pedaling with a force of 168 n, causing an acceleration of 2.8 m/s2, what is naoki's mass?

According to the tide table below what time of day will the highest tide occur?

How could a student test the effect of removing heat from a gas that is stored in a sealed container? what must occur in order for matter to change states?