Problem5 (5 pts): the heating of home to increase its temperature must be modeled as an open system, because expansion of the household air at constant pressure results in leakage of air to outdoors. assuming that the molar properties of air leaving the home are the same as those of air in the home, show that energy and mole balances yield the following differential equation: dn du where q is the rate of heat transfer to the air in the home, and t is the time. quantities p, v, n, and u refer to the air in the home.

An electron and a proton have the same kinetic energy upon entering a region of constant magnetic field and their velocity vectors are perpendicular to the magnetic field. suppose the magnetic field is strong enough to allow the particles to circle in the field. note: you'll need to look up the masses for an electron and proton. 1) what is the ratio of the radii of their circular paths rp/re?

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?

Which of these metals are magnetic?