Seorang wanita yang mempunyai massa 50 kg meletakkan seluruh berat badannya pada salah satu hak sepatunya ketika berjalan diatas lantai kayu luas alas sepatunya 1 cm2. hitung tekanannya ketka berjalan di atas lantai ? (g=9,8 m/s2)

Which situation will produce the greatest change of momentum

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?

What is friction? how does it affect the motion of an object?