Can someone to explain the last column of the chart and the second part of the net force column (value and direction; i need with the direction part)

Determine the amount of work done when a crane lifts a 100-n block form 2m above the ground to 6m above the ground

At an oceanside nuclear power plant, seawater is used as part of the cooling system. this raises the temperature of the water that is discharged back into the ocean. the amount that the water temperature is raised has a uniform distribution over the interval from 10° to 25° c. what is the standard deviation of the temperature increase?

The diagram shows a series of volcanic island and a hot spot determine the direction of movement of the tectonic plate that for the island