Giancoli Ch. 20 – p. 577, Problems #1-8 key
Giancoli Ch. 20 – p. 578, Problems #9-17 key
Giancoli Ch. 20 – p. 578-580, Problems #26-32, 36-39, 41-42, 47 key
Giancoli Ch. 20 – p. 581-583, Problems #67-68, 70-73, 81, 83-84 key
Giancoli Ch. 21 – p. 610, Problems #1-15 key