2Mg(s) + 02 (8) → 2Mgo (s) If 21.2 kcals of energy is released by this reaction, how
many kJ of energy does the reaction release? (1 cal =

The mass of the sun is 1.99×1030kg and its distance to the earth is 1.50×1011m. what is the gravitational force of the sun on the earth?

Assume you measured the mass of the cart to be (500 ± 1) g and the mass of the additional mass you put on the cart to be (500 ± 1) g as well. since the scale you are using in the lab cannot measure objects heavier than 600g you will have to sum up individual pieces and propagate the error. so what would be the mass and the standard error of the cart and the mass

The particles that are found in the nucleus of an atom are