Atraffic light consists of a horizontal member attached to a vertical support post. the horizontal member extends 7 m to the left of the support post and has a constant mass density of 15 kg/m. each traffic light has mass of 10 kg, and the street sign has a mass of 5 kg. make sure the connection between the horizontal member and the vertical support post is strong enough to withstand the forces exerted on the horizontal member. calculate the effects of the forces resulting from the two traffic lights and the street sign on the horizontal member.

answer: i think he can see forward ten seconds and move forward ten seconds but giorno can undo his actions with ger.

explanation:

no. dot product   =0 when vecs at right angles

its c i just checked it

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.