Here are the answers to your questions:
19. An object moves a distance of 10 meters in 5 seconds. What is the average speed of the object?
- Average speed = Total distance / Total time = 10 m / 5 s = 2 m/s
- b. 2.0 m/s
20. Jamal pushing with a 100-Newton (N) force on a large box. Neither Jamal nor the box move when he pushes on it. What force is the box applying on Jamal?
- According to Newton's third law, for every action, there is an equal and opposite reaction. Therefore, the box exerts a force of 100 N in the opposite direction.
- a. a 100 N force in the opposite direction that Jamal is pushing it
21. If a dolphin swims at 1.85 m/s, how far will the dolphin have traveled after 6.0 s?
- Distance = Speed × Time = 1.85 m/s × 6.0 s = 11.1 m (rounded to 11 m).
- c. 11 m
22. An atom of an element can change into an atom of another element if it is:
- Atoms can change into other elements primarily through radioactive decay processes or nuclear reactions.
- b. radioactive and its nucleus can trap or emit particles
23. What is the difference between speed and velocity?
- Speed is a scalar quantity (only magnitude), whereas velocity is a vector quantity (magnitude and direction).
- c. Velocity has direction.
24. What two subatomic particles have the greatest mass?
- Protons and neutrons have approximately the same mass and are significantly more massive than electrons.
- a. protons and neutrons
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