A cup contains 500 g water initially at a temperature of 100oC. This cup is put in a large room of temperature of 20oC.
a/ What will be the temperature of the water if the cup stays in the room for a long time? Explain your
answer.
b/ Compute the change of entropy of the system water – room, knowing that the heat capacity of water is
4186 J/(kg. K).

Unpolarized light of intensity i_0=750w/m^2 is incident upon two polarizers. after passing through both polarizers the intensity is i_2=280w/m^2. (a) what is the intensity of the light after it passes through the first polarizer in w/m^2? (b) write an equation for the angle between the polarizers in terms of the initial (i_0) and final (i_2) intensities. (c) find the angle between the polarizers in degrees.

Which subatomic particle has a negative charge

Aboat radioed a distress call to a coast guard station. at the time of the call, a vector a from the station to the boat had a magnitude of 45.0 km and was directed 15.0° east of north. a vector from the station to the point where the boat was later found is = 30.0 km, 15.0° north of east. what are the components of the vector from the point where the distress call was made to point where the boat was found? in other words, what are the components of vector c = b - a?