Questions of first course and answer

Ministry of Higher Education Primary - Studies
and Scientific Research Second class stage
Babylon University Allowed time is 3 Hours
College of Science Differential Equations
Physics Department 19 / 1 / 2019
Final Examination Questions of first course for scholar year 2018 – 2019 First attempt
Remake : Answer Five questions . (10 marks for each question )
Solve the 1st ODEs.





Solve the 2nd ODEs




Placed a metal bar, at a temperature of 100°F in a room with constant temperature of 0°F. After 20 minutes the temperature of the bar is 50°F. Determine:
1. The time required to reach the bar at a temperature of 25°F .
2.The temperature of the bar after 10 minutes.







Lecturer Fouad H. A. Alsharify Prof. Dr. Raheem G. Kadhim
Instructor Head of department



Solve the 1st ODEs.















Solve the 2nd ODEs












































Placed a metal bar, at a temperature of 100°F in a room with constant temperature of 0°F. After 20 minutes the temperature of the bar is 50°F. Determine:
1. The time required to reach the bar at a temperature of 25°F .
2.The temperature of the bar after 10 minutes.










To find











Put
































Solving, we obtain