1. Sitting in the outfield bleachers, 170 m from home plate , you see a
bafter hit the ball for a home run. How long after you see the ball hit do
you hear the crack of the bat?
2. At Zion National Park a loud shout produces an echo 1.75 s later
from a colorful sandstone cliff. How far away from the shouter is the
clift? (Hint: The echo reflects off the distant cliff and returns to its
source. Use the equation d = vt to solve for distance.)
re
put
cules

it is called kinetic energy

when heated, the valance electrons increased their speed and transferred the heat from electron to electron.   i just took the test.

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 old price per ounce is c/4.

the new price per ounce is c/3.6.

the ratio of the old price to the new one is

(c/4)/(c/3.6) = (c/c)×(3.6/4) = 0.9 . . = 9/10 . . "nine tenths" in either form