What tvo factors affect the speed of a sound wave as it travels through a medium? O the energy transferred by the wave and the density of the medium
o the type of medium and the energy transferred by the wave
O the type of medium and the temperature of the medium
o the temperature of the medium and the energy transferred by the wave

For which pair of objects would adding the same a

If forces acting on an object are unbalanced. true or false

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?