GEOLOGY

Detailed explanation-1: -Answer: 12kg rice bag at the height of 10m has the highest potential energy .

Detailed explanation-2: -You pick up your school bag by muscular force.

Detailed explanation-3: -It is difficult to hold a school bag having a thin strap because the pressure on the shoulders is quite large. This is because the pressure is inversely proportional to the surface area on which the force acts. The smaller is the surface area; the larger will be the pressure on the surface.

Detailed explanation-4: -School bags are provided with broad straps to increase the surface area in contact with the shoulders and reduce pressure on the shoulders. If thin straps would be used, the surface area in contact with the shoulders would decrease which will lead to an increase in pressure on shoulders.

Detailed explanation-5: -School bag is one of the most essential items for school kids. It is used as a medium to transport different materials like exercise books, pencil box, water bottle and a lunchbox to and from school. Apart from this, a school bag helps a child to keep his belongings safe from external damage like sun, dust or rain.