Aball is slightly too large to fit through a hole in a flat plate. the drawing shows two arrangements of this situation. in arrangement i the ball is made from metal a and the plate from metal b. when both the ball and the plate are cooled by the same number of celsius degrees, the ball passes through the hole. in arrangement ii the ball is also made from metal a, but the plate is made from metal c. here, the ball passes through the hole when both the ball and the plate are heated by the same number of celsius degrees. rank the coefficients of linear thermal expansion of metals a, b, and c in descending order (largest first).

in physics zero. in muscle fatigue could be high

massxgravity x heght=weightxheight= pe

4900=490xh

h=10

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.