PHYS 2212 Chapter 25.1-25.3: Phys_2212_25.1-25.3

Solve

F external = F initial x e^-at x cos(wt)

Hint: e^-at x cos(wt) = Re x ( e^-at + iwt ) = Re x ( e ^ bt ) , b= -a + iw

a is alhpa, b is beta

Solution forms Ae^(bt-id)

Given that efficiency is defined as e = (what youget)/(what you had to pay), how might one define the concept of'inefficiency?" Show answer in terms of a mathematical relationshipto relate the definition of inefficiency, using the letter"i', to the definition of efficiency e.

Draw the phasor for the EMF e=(170v)cos((2π×60hz)t) at t=60ms.