A. What is the change in momentum of a 60 g egg dropped from 3.5 m high onto concrete? The velocity right before it hits the ground is -8.29 m/s.

adding a(n) to an electric circuit would increase the magnetic field around a wire;

b. solenoid

a solenoid is a type of electromagnet whose purpose is to generate a controlled magnetic field.

if the purpose of the solenoid is instead to impede changes in the electric current, a solenoid can be more specifically classified as an inductor rather than an electromagnet.

b. lifting dumbbell weight at 20-degree angle from the body after a 45-degree angle

electric field is a function of 1/r^2

yes, the force per unit charge for a point charge is inverse square law.