Which diagram represents an object in equilibrium? Ο Α.
applied
force = 20 N
force due to
friction = 15 N
B.
applied
force = 20 N
-
force due to
friction = 20 N
Ос.
applied
force = 15 N
force due to
friction = 25 N
D.
applied
force = 30 N
force due to
friction = 20 N
O E.
applied
force = 30 N
force due to
friction = 15 N

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.

higher potential

explanation:

because it is in a high speed so it must move into a of high potential