Part a how much ce at a temperature of 24 9℃must bo dropped nto the water so that the final temperature ofthe system will be 370°c? take the specific heat of liquid water to be 4190 j/kg k, the specific heat of ice to be 2100 j/kg k, and the heat of fusion for water to be 3.34-10 j/kg view available hint(s) 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?