The you Place them why? ? ii. With six coins still on the left, three coins are put on the right at mark 4. Where on the right should you pile an addition of six coins to get a balance? b. A crowbar used for turning a stone is shown in the diagram. In which direc or B) is the pivot to be shifted to increase the mechanical advantage? Write load reason. umerical Problems A load of 680 N is lifted from A to C by 500 N force on an inclined plane as shown in the diagram. Study the diagram and calculate: i Output 500N​

speed of light in vacuum is 300,000 km/s

speed of light in other mediums is given by the expression v = c/n, where c is the speed of light in vacuum and n is the refractive index of medium.

for the first medium v = 200,000 km/s

  so, refractive index of medium = 300000/200000 = 1.5

    1.5 refractive index is usually for glass. so first medium is glass.

for the second medium v = 250,00 km/s

so, refractive index of medium = 300000/250000 = 1.2

    1.2 refractive index is usually for water. so second medium is water.

for the third medium v = 0 km/s

so, refractive index of medium = 300000/0 = ∞

    ∞ refractive index is usually for opaque mediums. so third medium is opaque medium.

because if the tool that you are using is not balanced it there would be false mass.