Chapter 4 QuickCheck Questions

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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.

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)

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)?

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 = 4.933 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?”