Calculate the work done if Boulder of mass 10gk is rolled 40m up slope at an angle of 20°.assumw the force of friction is negligible​

G= 0 L = my G= 0 Show that if a slab is rotating about a fixed axis perpendicular to the slab and passing through its mass center G,the angular momentum is the same when computed about any other point P. P G V 988

vapour or gas assuming atmospheriv pressure

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.