You cool a 130.0 g slug of red-hot iron (temperature 745 ∘c) by dropping it into an insulated cup of negligible mass containing 85.0 g of water at 20.0 ∘c. assume no heat exchange with the surroundings. how do you do this? part a what is the final temperature of the water? part b what is the final mass of the iron and the remaining water?

Which is not a source of noise pollution? a)airplanes b)acid rain c)machines d)cars

Three different objects, all with different masses, are initially at rest at the bottom of a set of steps. each step is of uniform height . the mass of each object is a multiple of the base mass : object 1 has mass 4..00m , object 2 has mass 1..96m , and object 3 has mass . when the objects are at the bottom of the steps, define the total gravitational potential energy of the three-object system to be zero. if the objects are then relocated as shown, what is the new total potential energy of the system? each answer requires the numerical coefficient to an algebraic expression. each algebraic expression is given using some combination of the variables , , and , where is the acceleration due to gravity. enter only the numerical coefficient. (example: if the answer is 1..23mgd , just enter 1.23)

The ozone hole appears in antarctica during