00:00 -1:54 Breif wrap up of the surface integral
1:55-5:30 Problem 4 , Question 1
5:31 - 12:32 Problem 4 , Question 2 ( having 2 surfaces)
12:33- 18:59 Problem 4 , Question 3 ( equations of surface vs boundries)
19:00 - 24:04 Problem 5 , Question 1 ( having 2 surfaces )
24:05 - 31:54 Problem 5 , Question 2
( having 4 surfaces )
