80m south and 20m west magnitude number and direction

the answer is b

explanation:

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.

prndulum needs thread, weight clock to time swings

490 n

f=125n a=2.5m/s2