A machine in a factory pushes a 500-N box forward with a horizontal force of 25 N for a time of 30 s. Ignoring friction, by how much does the momentum of the box change?
(A) 4.0 x 102 N • s (B) 7.5 x 102 N • s (C) 5.0 x 103 N • s (D) 1.5 x 104 N • s

two charges are fixed in place on the x-axis as shown. the charge at x = 0 is negative and has magnitude q = 2 μcoulombs (1 μcoulomb = 10-6 coulombs). the charge at x = d, (d = +12 cm), is positive and has magnitude q = 4 μcoulombs. find a point x = xo along the x-axis at which the electric field is zero.

see earlier

no. bullets are macro objects. wave nature is for light waves, extremely tiny particles. if a light particle was the size of your finger, the bullet would be the size of the universe. so basically, that huge difference in size makes the wave nature of matter insignificant.