How does the movement of molecules inside a solid block of iron change as the iron is heated? a. the molecules move faster. b. the molecules move slower. c. the molecules stop moving completely. d. the molecules move in the same way at all temperatures.

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