An object of mass m attached to a spring of force constant k oscillates with simple harmonic motion. the maximum displacement from equilibrium is a and the total mechanical energy of the system is e. part apart complete what is the system's potential energy when its kinetic energy is equal to 34e? view available hint(s) what is the system's potential energy when its kinetic energy is equal to ? ka2 ka22 ka24 ka28 submitprevious answers correct part b what is the object's velocity when its potential energy is 23e? view available hint(s) what is the object's velocity when its potential energy is ? ±km−−√a ±km−−√23−−√a ±km−−√a3√ ±km−−√a6√ submitprevious answers

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.

myth. it was once thought that animals, including cats and dogs, could only see in black and white. however, scientists have proven this to be a myth. in all animals, including humans, the perception of colour is determined by the presence of cells in the eye called cone photoreceptors.