copper calorimeter weighs 100g when emptied ,400g when half filled of water at 0°c, and 450g when iced at 0°c is added. when some stem passed into the mixture ,its temperature is rised by 10°c Find the quantity of stem added.(specific latent hear of fusion of ice=3.36×10⁵j/kg

Electric field of the earth. the earth has a net electric charge that causes a field at points near its surface equal to 150 n> c and directed in toward the center of the earth. (a) what magnitude and sign of charge would a 60-kg human have to acquire to overcome his or her weight by the force exerted by the earth’s electric field? (b) what would be the force of repulsion between two people each with the charge calculated in part (a) and separated by a distance of 100 m? is use of the earth’s electric field a feasible means of flight? why or why not?