What force has to the student applied to the ice

Q1. The pH of the inner thylakoid space has been measured, as have the pH of the stroma and of the cytosol of a particular plant cell. Which, if any, relationship would you expect to find?

Q2. A student tests the second law of motion by acceleration a block of ice at a rate of 3.5 m/s2. If the ice has a mass of 12.5 kg, what force has to the student applied to the ice?

Q3. The atomic mass of a sample of oxygen, which has O-16, O-17, and O-15 isotopes, is given on periodic table as 15.9995. How was this number determined?

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