Please help me with these questions 1.Find the pressure at the bottom of a column of mercury 76 cm. The relative density of mercury is 13.6.

2.A cube with sides 3cm is made of a material of density 9 gram per centimetre tube. Find the mass of the cube.

Electoral current force mechanical advantage if the wheel and axle is 2 n and the output force is 20 n

The answer is a.  i hope this

What formula  this one  (x_/

The answer is water molecules are split.cellular respiration and photosynthesis are complement  reactions to each other. these are reverse reactions. in cellular respiration glucose and oxygen yield water and carbon dioxide. so, when respiration begins,  glucose molecules are split. in the opposite reaction - in photosynthesis, carbon dioxide and water yield glucose and oxygen. thus,  when respiration begins, water molecules are split.