Un bloque de hierro de 500g a 100C° se coloca en 500g de agua a 20C° ¿cual es la temperatura final de la mezcla de hierro y agua? ( el calor específico del hierro es aproximadamente 0.11 cal/ gC°)

You carry a 7.0-kg bag of groceries 1.2 m above the ground at constant speed across a 2.7m room. how much work do you do on the bag in the process? (a) 157j (b) 0.00j (c) 185j (d) 82j

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.

How many atoms of nitrogen are in the chemical formula ni(w on