The disk of the milky way galaxy is about 1.0 ✕ 105 light-years (ly) in diameter. the distance from the center of the milky way to the center of the andromeda galaxy is about 2.0 million ly. (a) imagine a scale model where the two galaxies are represented by circular plates. if the plate representing the milky way has a diameter of 24 cm, what would be the distance between the centers of the two plates in meters? m (b) what if? the milky way and andromeda galaxies are members of the local group, a cluster of more than 50 galaxies spread across a spherical volume with a diameter of 10 million light years. imagine you could create a scale model of the local group with the milky way and represented as circular plates with diameters of 24 cm. what would be the diameter (in m) of your spherical scale model of the local group? m

What elements are found in the inner and out core of the earth? the correct layers of earth's interior from the top to the center? what is the unwanted material that is removed from a mine called? how much stronger is an earthquake that registers 5 on the richter as opposed to 2? what occurs at a convergence plate boundary? the majority of the the earth's rock what is the most common element found in the earth's crust? what element is found in pyrite that contributes to acid mine drainage? why must mining companies post bond prior to permitting? how are bacteria being used in treating effluent from mines? what is a problem of acid mine drainage in rivers and soils? what do tectonic plates move on? why is gold smelting so damaging? how are artesian wells formed? where is dammed water colder than the river it flows into? what is one of the problems of uncontained aqueducts? what is the largest use of industrial water? underground sand and gravel formations that can store water? what type of water test measure acidity? which type of water test for cloudiness from suspended solids? what water test measures the amount of calcium and magnesium? these are all problems of coal power plants all of the following are advantages of riparian lands along rivers what type of water would be the warmest and have the least amount of dissolved oxygen? the zone of aeration is

On a day when the barometer reads 75.23 cm, a reaction vessel holds 250 ml of ideal gas at 20 celsius. an oil manometer ( ρ= 810 kg/m^3) reads the pressure in the vessel to be 41 cm of oil and below atmospheric pressure. what volume will the gas occupy under s.t.p.?

What is the force that opposes motion and works against the downward pull? a) friction b) gravity c) weight d) acceleration