Understanding Scalars and Vectors in Physics

1. Chapter 3.1-3.2 Review

2. 1. Which of these are scalars and which are vectors?A. 50 m/sB. 10 m northC. 15 degrees CelsiusD. 10 m/s upE. 10 paces toward the big treeF. 22 N toward the center of the earth

3. 1. Which of these are scalars and which are vectors?A. 50 m/s SCALARB. 10 m north VECTORC. 15 degrees Celsius SCALAR D. 10 m/s up VECTORE. 10 paces toward the big tree VECTORF. 22 N toward the center of the earth VECTOR

4. 2. A cat runs 15 meters north, turns right and runs 55 meters east. What is his total displacement?

5. 152 + 552 = c2c = 57 mtanq = 15/5515°north of east

6. 3. A hummingbird flies straight up for 8 meters, and then flies south for 6 meters. What is the total displacement of the hummingbird?

7. 82 + 62 = c2c = 10 mtanq = 6/837°south of up

8. 4. An airplane at takeoff flies 6055 m at an angle of 35° to horizontal. What are the horizontal and vertical components of this displacement?

9. sin35° = y/6055 y= 3473 mcos35° = x/6055 x= 4960 m

10. 5. A support board in a house that is under construction is holding up a wall frame. It is 5.3 meters in length and is at an angle of 60° to the floor. How tall is the wall, and how far is the base of the wall from where the support board touches the floor?

11. sin60° = ht/5.3 ht= 4.6 mcos60° = b/5.3 b= 2.65 m

12. 6. A bowling ball rolls 22 m down an incline with an angle of 9°. What are the horizontal and vertical components of this motion?

13. sin9° = y/22 y= 3.4 mcos9° = x/22 x= 21.7 m

14. 7. Blood moves throughout your body in the circulatory system. What is the displacement of a single red blood cell as it moves from the mitral valve in your heart through 5 meters of arteries, capillaries and veins and returns to the mitral valve?

15. 0, displacement is the change in location. Since the blood cell returns to its original location, the displacement is zero.