the largest airplane every build is the hughes h-4 hercules flying boat its 97.5 m wingspan is still 9.1 longer than the next largest plane ever to be built however because it is made of birch not spruce as its populare nickname the spruce goose would suggest the mass of the h-4 is 1.81 x 10^5 kg considerably lighter than any other giant plane. The h-4 was flown only once over a distance of about 1.6 km if the maximum gravitational potential energy associated with the h-4 was 3.78 x 10^7 j how high did it fly

current and voltage can both be different in different parts of a circuit so it matters where you place the ammeter and voltmete

option number c is the right answer.

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.