With the first vector (F1), fixed on approximetly 300. and it is magnitude is 6N. (vector a) The second vector ( F2), fix it about 100o angle and control it is value as 8 N. (vector b) The second vector ( F2) , fix it about 145o angle and control it is value as 11 N. (vector c) Find the resultant force of these three forces using Phet simulation FR. FR=………qR=………

v 154.9= 0.9 length length s little over 154.9cm

pe = weightxheight = 2000x1000=2,000,000joules

i think the answer is a, hope this : )

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.