Zad 1,4 str 67 Fizyka klasa 7 (to jest fizyka (nowa era)) i 5 m/s 20 m/s i 27 m/s na km/h. 50 km/h 75 km/h i 140 km/h na m/s prosze potrzebuje na teraz
daje naj

i think they are all correct

explanation:

they seem good

b.a device that inputs heat into a cool object

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.

the answer is 100. i just did this lesson and got a 100% on it. : )

-fishtank