1. Vectors
Day 7
Lyzinski Physics

2. 29)

3. 30)
31)

4. 32)
33)

5. 34)
35)

6. 36)

7. 37)
38)

8. 39)

9. 40)

10. # 40, continued

11. Day #7

12. Plane Problems

13. Important things to know:
P: Plane W: Wind G: Ground
vPG = vPW + vWG
“airspeed” means VPW
You can use d = rt in these problems only because a = 0

14. vPG = vPW vWG
Example: A plane is flying with an airspeed of 400 mph in the northeast direction. Wind is blowing towards the North at 50 mph. Find the velocity of the plane relative to the ground.
45o
400 =
282.84 50 =
436.8
49.6o
VPG = mph [E 49.6o N]

15. A difficult plane problem
From tonight’s HW 
45)
vPG = vPW vWG
40o
200 km/h
30 km/h ?
22.98 km/h
19.28 km/h x: y:
= km/h
0 – = km/h
km/h
22.98 km/h
VPG
VPG = km/h [W 7.2o S]

16. vPG = vPW + vWG vPW = vPG + -vWG [W 6.6o N] ??? 45) rearranging
200 km/h
40o
30 km/h
22.98 km/h
19.28 km/h
??? q x: y:
unimportant for this problem
[W 6.6o N]
200sin(q) = 22.98
q = sin-1 (22.98/200) = 6.6o

17. Tonight’s HW “Days #6 & #7 Relative Velocity HW Problems”
#’s (from the packet)
Do Buffa, pg. 101, problems 102, 105