Determine the magnitude of the force p required to hold the 180-kg crate in equilibrium.

When tackling a problem in equilibrium, always keep in mind that all forces in any direction are all balance out. Let us imagine that this 180 kg crate is being held by a wire. The Force "p" necessary to put this crate in equilibrium will be the tension on wire acting upward. Remember that weight "W"is a force, and force according to Newton's law is equal to mass multiply by acceleration. F=W=mg. The total force needed to balance the mass is simply Force "p=mg". Therefore the magnitude of the force will be just multiplying mass and the normal pull of gravity, equivalent to 9.8m/s².  

the best answer for these questions would be:

1.            c. is smaller

2.            d) concrete operational

3.            b) interaction with the environment – the children interact with their environment can them learn more.

4.            a) parents who reason openly with children can limit a child’s cognitive ability.

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.