1. Chapter 4 QuickCheck Questions

2. QuickCheck 4.1
A particle undergoes acceleration while moving from point 1 to point 2. Which of the choices shows the velocity vector as the object moves away from point 2?
Slide 4-23

3. QuickCheck 4.1
A particle undergoes acceleration while moving from point 1 to point 2. Which of the choices shows the velocity vector as the object moves away from point 2?
Slide 4-24

4. QuickCheck 4.4 A particle is launched and follows the black path.
Which of these is the acceleration vector at the highest point?
Slide 4-34

5. QuickCheck 4.4
A car is slowing down as it drives over a circular hill.
Which of these is the acceleration vector at the highest point?
Acceleration of changing direction
Slide 4-35

6. QuickCheck 4.4 A particle is launched and follows the black path.
Which of these is the net force vector at the highest point?
Slide 4-34

7. QuickCheck 4.4
A car is slowing down as it drives over a circular hill.
Which of these is the acceleration vector at the highest point?
Force in direction of acceleration
Slide 4-35

8. QuickCheck 4.5
A heavy red ball is released from rest 2.0 m above a flat, horizontal surface. At exactly the same instant, a yellow ball with the same mass is fired horizontally at 3.0 m/s. Which ball hits the ground first?
The red ball hits first.
The yellow ball hits first.
They hit at the same time.
Slide 4-53

9. QuickCheck 4.5
A heavy red ball is released from rest 2.0 m above a flat, horizontal surface. At exactly the same instant, a yellow ball with the same mass is fired horizontally at 3.0 m/s. Which ball hits the ground first?
The red ball hits first.
The yellow ball hits first.
They hit at the same time.
Slide 4-54

10. QuickCheck 4.6
A 100 g ball rolls off a table and lands 2.0 m from the base of the table. A 200 g ball rolls off the same table with the same speed. It lands at distance
1.0 m.
Between 1 m and 2 m.
2.0 m.
Between 2 m and 4 m.
4.0 m.
Slide 4-55

11. QuickCheck 4.6
A 100 g ball rolls off a table and lands 2.0 m from the base of the table. A 200 g ball rolls off the same table with the same speed. It lands at distance
1.0 m.
Between 1 m and 2 m.
2.0 m.
Between 2 m and 4 m.
4.0 m.
Slide 4-56

12. QuickCheck 4.7
Projectiles 1 and 2 are launched over level ground with the same speed but at different angles. Which hits the ground first? Ignore air resistance.
Projectile 1 hits first.
Projectile 2 hits first.
They hit at the same time.
There’s not enough information to tell.
Slide 4-61

13. QuickCheck 4.7
Projectiles 1 and 2 are launched over level ground with the same speed but at different angles. Which hits the ground first? Ignore air resistance.
Projectile 1 hits first.
Projectile 2 hits first.
They hit at the same time.
There’s not enough information to tell.
Slide 4-62

14. QuickCheck 4.8
Projectiles 1 and 2 are launched over level ground with different speeds. Both reach the same height. Which hits the ground first? Ignore air resistance.
Projectile 1 hits first.
Projectile 2 hits first.
They hit at the same time.
There’s not enough information to tell.
Slide 4-63

15. QuickCheck 4.8
Projectiles 1 and 2 are launched over level ground with different speeds. Both reach the same height. Which hits the ground first? Ignore air resistance.
Projectile 1 hits first.
Projectile 2 hits first.
They hit at the same time.
There’s not enough information to tell.
Slide 4-64

16. QuickCheck 4.9
A factory conveyor belt rolls at 3 m/s. A mouse sees a piece of cheese directly across the belt and heads straight for the cheese at 4 m/s. What is the mouse’s speed relative to the factory floor?
1 m/s
2 m/s
3 m/s
4 m/s
5 m/s
Slide 4-70

17. QuickCheck 4.9
A factory conveyor belt rolls at 3 m/s. A mouse sees a piece of cheese directly across the belt and heads straight for the cheese at 4 m/s. What is the mouse’s speed relative to the factory floor?
1 m/s
2 m/s
3 m/s
4 m/s
5 m/s
Slide 4-71

18. A Jeep drives off a building moving at 30 m/s
A Jeep drives off a building moving at 30 m/s. If it lands with a TOTAL final velocity of 50 m/s, how tall was the building? Use g = -10.

19. A Jeep drives off a building moving at 30 m/s
A Jeep drives off a building moving at 30 m/s. If it lands with a TOTAL final velocity of 50 m/s, how tall was the building?
Answer: 80 m (vertical component was 40 m/s, so 4 sec to fall and hit ground)

20. If a soldier fires the cannon at 25 m/s at a launch angle of 30 degrees, where would be a really terrible place (dx) for an enemy soldier to be standing?
How high does the cannonball go (dy)?

21. If a soldier fires the cannon at 25 m/s at a launch angle of 30 degrees, where would be a really terrible place (dx) for an enemy soldier to be standing?
How high does the cannonball go (dy)?
T = sec to hit.
Dx = (21.65)(4.933)=106.8 m
T to highest=1.25 sec,
So Dy=7.81 m
What did the ringmaster say when the human cannonball said he was retiring?
“Crud, where will I ever find another man of your caliber?”