Sample Item 15 SC.8.P.8.4
Matthew has six cubes of different materials. Each cube has a mass of 10 grams (g).
Matthew sorts the cubes into two groups using one physical property.
GROUPS OF DIFFERENT MATERIALS
Group 1 Cubes
Group 2 Cubes
Aluminum
Glass
Copper Plastic
Steel
Wood
Which physical property did Matthew most likely use to sort the cubes into two groups?
A. density
B. magnetism
C. melting point
D. electrical conductivity

what is the speed of a softball that travels 20m in 2secs

speed = 20/2 = 10 m/s

the answer would most likely be c, because if it's a comical piece of information, it may likely not be true, if it's a site that allows anybody to edit the content, it could mean a five year old is typing the info, and if it's a tv show produced by a celeb, it may have a biased opinion.

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.