What is the difference between a dimension and a unit?

An electrical motor raises a 50kg load at a construct velencity .calculate the power of the motor, if it takes 40sec to raise the load through a height of 24m(take g =9.8n/g)

What is the main objective of using reheat rankine cycle?

What is the major difference between thermoplastics and thermosetting plastics from the polymerization structure point of view?